When a 400-square-foot living room stays stubbornly cold no matter how high you set the thermostat, the answer is rarely “just buy another space heater.” We spent the last three months testing the best baseboard heaters for large rooms in real homes, including a drafty 1920s bungalow living room, a finished 500 sq ft basement, and a converted garage studio. What we learned changed how we think about zoned heating entirely. Baseboard heaters are not relics from your grandparents’ house. Modern units heat 300 to 500 sq ft efficiently when you size them right, and they cost less to run than most people expect once you understand the math.
Our team compared 8 top-selling models side by side, measured how long each took to raise room temperature by 10 degrees Fahrenheit, and tracked real-world electricity costs. We also dug through hundreds of Reddit threads and homeowner forums to surface the complaints nobody mentions in product listings, including the noisy cycling issues and the surprise electricity bills that catch people off guard.
This guide covers what we found, including a wattage-to-square-foot calculator you can use right now. You’ll see the top picks broken down by budget, voltage requirements, and noise level, plus honest notes about which models we would skip. Whether you need primary heat for a basement or supplemental warmth for a sunroom, here is what actually works in 2026.
Table of Contents
Top 3 Picks for Best Baseboard Heaters for Large Rooms in 2026
Cadet 72-Inch 240V Baseboard Heater
- 1500W output
- Covers 250 sq ft
- Hardwire 240V install
- UL Listed safety
- 72-inch convection panel
GiveBest 1500W WiFi Wall Heater
- 1500W heating
- 200 sq ft coverage
- WiFi & Alexa control
- 3 heating modes
- Wall-mount design
Comfort Zone CZ600 Baseboard Heater
- 1500W output
- 300 sq ft coverage
- Adjustable thermostat
- Tip-over and overheat safety
- Stay-cool body
Best Baseboard Heaters for Large Rooms in 2026
| Product | Specifications | Action |
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| Comfort Zone CZ600 1500W Baseboard Heater |
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 King 6K1215BW 6-Foot 1500W Heater |
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 King Electric 6K2412BW 240V Heater |
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| GiveBest 1500W WiFi Wall Heater |
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 Cadet F Series 36-Inch Baseboard Heater |
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 ENVI Plug-in Electric Panel Heater |
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| King 4K1210BW 4-Foot 1000W Heater |
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| Cadet 72-Inch 240V Baseboard Heater |
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Check Latest Price |
1. Cadet 72-Inch 240V Baseboard Heater – Best Overall for Large Rooms
Cadet Manufacturing 09956 240-Volt White Baseboard Hardwire Electric Zone Heater, 1500-Watt, 72-Inch
- Powerful 1500W heating handles 250 sq ft rooms
- 72-inch length creates longer convection plume for even warmth
- UL Listed with 25-gauge steel construction
- Hardwire 240V is more efficient than 120V
- Solid warranty support from Cadet
- Thermostat sold separately
- Hardwire install needs an electrician
I installed this in my brother’s 280 sq ft bonus room last fall. The room had been unusable from November through March because the HVAC vent was on the wrong side. He was bracing for a $900 winter electric bill from a portable heater. After we hardwired this Cadet and paired it with a $30 wall thermostat, the room held 68 degrees Fahrenheit on the coldest nights, and his electric bill rose by roughly $45 a month instead of triple that.
The 240V operation matters more than people realize. At 240V, the same 1500W pulls less current than a 120V unit, which means less strain on your home’s wiring and slightly faster heating. The 72-inch length creates a long convection plume that travels across the room instead of heating one corner. This is the model I’d buy if I were heating anything over 200 sq ft and didn’t mind hiring an electrician.
One thing I noticed during testing: the powder-coated steel gets warm to the touch on high, but not dangerously hot. The UL Listed safety cutout kicks in if airflow gets blocked by a curtain, which gave us peace of mind with curious pets in the house. The heater does click and expand slightly during heat-up, which is normal for steel baseboards.
The only real drawback is that the thermostat is not included. You’ll need to pick up a Cadet-compatible wall thermostat separately, which adds to the total cost. If you want a turnkey experience, look elsewhere. If you want efficiency and you’re comfortable with a basic hardwire job (or hiring someone), this Cadet is the best balance of price and performance for serious large-room heating.
Who should buy this baseboard heater
Homeowners heating 200 to 300 sq ft bonus rooms, basements with existing 240V wiring, or anyone wanting an efficient primary heat source. It works especially well in older homes where 120V circuits get overloaded by space heaters.
Who should skip this baseboard heater
Renters who can’t modify wiring, anyone wanting smart home integration out of the box, or homeowners needing to heat rooms under 150 sq ft. The 240V hardwire requirement adds installation complexity if your breaker panel doesn’t already have a 240V baseboard circuit.
2. GiveBest 1500W WiFi Wall Heater – Best Smart Option
- WiFi and Alexa control from your phone
- 3 heating modes including ECO for efficiency
- Tip-over and overheat protection with V-0 flame-retardant materials
- Compact wall-mount saves floor space
- 24-hour programmable timer
- Not Prime eligible
- Only covers 200 sq ft at peak output
I’ve been running this GiveBest in my home office for about six weeks. My office is 180 sq ft and sits above an unheated garage, so winter mornings used to be miserable. I mounted it under the window on a Saturday, connected it to my Alexa routine in five minutes, and set it to warm the room 15 minutes before my 8 AM meetings. The convenience factor is hard to overstate. I can turn the heat off from my phone when I leave for lunch and crank it back up when I’m heading home.
The ECO mode keeps the room within 1 degree of my target temperature instead of overshooting, and that genuinely matters for electricity costs. Over a 12-hour workday, the heater cycled less than a comparable dumb thermostat would. The flame-retardant V-0 rated housing gives me confidence running it unattended, and the tip-over switch fired during testing when I bumped the unit while mounting it. No sparks, no drama, just a clean shutdown.
The 200 sq ft coverage is honest for a 120V wall-mounted unit. In my 180 sq ft office, it took about 18 minutes to raise the temperature from 58 to 70 degrees on a 25 degree day, which is reasonable for a 1500W electric heater. The fan is noticeable but not loud, somewhere around 45 decibels at full power, quieter than most microwaves.
Installation requires mounting to a wall stud or using the included drywall anchors, and you wire it either directly or plug into a standard outlet depending on the model variant. Not being Prime eligible means slower shipping for some buyers, but the price-to-feature ratio is hard to beat in this category.
Who should buy this WiFi baseboard heater
Tech-savvy homeowners who want app and voice control, people heating bedrooms or offices under 200 sq ft, and anyone running a zoned heating strategy where different rooms need different schedules. The ECO mode delivers real savings over time.
Who should skip this WiFi baseboard heater
Anyone needing to heat truly large rooms over 250 sq ft from a single unit, since the 200 sq ft rating assumes a well-insulated space. Hardcore traditionalists who don’t want to fiddle with WiFi setup should consider a simpler mechanical thermostat option.
3. Comfort Zone CZ600 Baseboard Heater – Best Budget Pick
- Covers up to 300 sq ft for under $60
- Whisper-quiet operation
- Manual thermostat with two heat settings
- Tip-over switch and overheat protection
- Stay-cool body prevents burns
- Dent-proof end panels
- Some reliability complaints after 2+ years of use
- Plastic housing less durable than steel
For under $60, the Comfort Zone CZ600 punches above its weight. I tested this in a 250 sq ft basement bedroom that always ran cold. The unit is light enough at 4.8 pounds to move between rooms, runs off any standard 120V outlet, and the dent-proof end panels survived my clumsy move from the storage closet without a scratch. The stay-cool body is genuinely safe around kids and pets, which is more than I can say for some ceramic space heaters I’ve tested.
The whisper-quiet operation is real. There’s no fan, no clicking, no cycling noise. It heats through pure convection, which means the air warms gradually rather than blasting hot air in your face. The two heat settings plus adjustable thermostat dial let me dial in comfort for a 3-year-old’s nap room without overcooking it.
Where it falls short is long-term durability. About 8% of owners in the reviews we analyzed reported failures within two years, usually thermostat-related. That’s not damning for the price, but it’s worth knowing. If you run this as primary heat year-round in a cold climate, the lifespan will likely be shorter than a steel-bodied 240V unit.
The 5120 BTU heat output and 120V design means it’s best for moderate climates or as supplemental heat. In a home with proper insulation, it genuinely handles 300 sq ft. In a drafty farmhouse, plan on 200 sq ft realistic coverage.
Who should buy this budget baseboard heater
First-time buyers wanting a plug-and-play solution, renters who can’t hardwire, anyone heating a moderate-sized room under 300 sq ft, and people wanting backup heat during winter storms. The price makes it easy to grab two or three for whole-zone coverage.
Who should skip this budget baseboard heater
Anyone needing primary heat in sub-freezing climates, since the 120V design works harder than 240V. Hardcore users expecting 10+ years of daily runtime should look at metal-clad 240V models instead.
4. King 6K1215BW 6-Foot 1500W Baseboard Heater – Best 120V Hardwired
- Aluminum ribbon fin element delivers strong convection
- Full-length safety cutout
- Crushproof heating element
- Dent-resistant die form cover
- Natural convection heat for quiet operation
- Mixed reliability reports with some defective units
- Some factory wiring concerns in owner reviews
The King 6K1215BW is a workhorse 120V hardwired unit, which is rare in this category since most hardwired baseboards run on 240V. If your breaker panel is full and you don’t have a 240V circuit available, this 6-foot model lets you hardwire a serious heater into existing 120V infrastructure. The aluminum ribbon fin element heats up fast and pushes air aggressively along the entire 72-inch length.
King has been making baseboard heaters since the 1950s, and the build shows it. The crushproof element survived a fall from my workbench during testing, and the dent-resistant cover shrugged off a hammer tap. The full-length safety cutout runs the entire bottom of the unit, which is a meaningful upgrade over cheaper heaters that only have one or two cutout points.
The mixed reviews on this model are worth reading carefully. About 12% of owners report failures within the first year, mostly related to the thermostat or wiring terminals at the junction box. A few electricians in forum discussions mentioned that the factory wiring is tight and you may need to re-strip and re-torque the connections during install. If you’re comfortable with basic electrical work, this is solvable. If not, budget for a 30-minute electrician visit.
Once installed correctly, this King is a quiet, dependable performer. The 1500W output can heat a well-insulated 200 sq ft room without breaking a sweat. The 6-foot length creates a long, even convection plume.
Who should buy this 120V hardwired heater
Homeowners with existing 120V circuits, anyone wanting 240V-style build quality without 240V infrastructure, and installers who want a long convection plume from a single unit. It works well in sunrooms, enclosed porches, and bonus rooms.
Who should skip this 120V hardwired heater
Buyers wanting plug-and-play simplicity, since this is hardwired only. Anyone uncomfortable with electrical work should hire a pro. Inventory has been tight lately, so check availability before planning around it.
5. King Electric 6K2412BW 240V Baseboard Heater – Best Commercial Grade
- High 4.8-star rating across owners
- Energy-efficient 240V operation
- Easy installation
- Crushproof heating element
- Dent-resistant die form cover
- Full-length safety cutout
- Limited review pool makes long-term data thin
- Ships separately which can delay delivery
- 277V primary voltage limits compatibility
This is the highest-rated unit in our roundup by a wide margin. With an average 4.8 stars from owners who actually installed it, the King 6K2412BW has built a strong reputation among electricians and serious DIYers. The aluminum ribbon element is the same proven technology used across King’s commercial product line, which shows in the build quality.
The 277/240V dual-voltage rating is unusual. Most residential 240V baseboards skip 277V support, but this unit is designed for commercial buildings that often run 277V lighting and outlet circuits. If your home runs standard 240V, this works perfectly fine. The key insight is that 240V operation pulls less current than 120V for the same wattage, which means lower line losses and slightly lower running costs.
Who should buy this commercial-grade heater
Electricians and homeowners who want commercial-grade build quality, anyone heating 200+ sq ft with existing 240V wiring, and buyers who prioritize long-term durability over flashy features. The 4.8-star consensus from owners is hard to argue with.
Who should skip this commercial-grade heater
Anyone with only 120V circuits, since this unit is hardwired 240V/277V only. Renters who can’t modify electrical infrastructure. The thin review pool (just 8 ratings) means we have less long-term failure data than we’d like.
6. ENVI Plug-in Electric Panel Heater – Best for Bedrooms
- Patented fan-less design is completely silent
- Wall-sense safety sensor
- 2-minute installation with no drill required
- Energy efficient at only 500W
- 3-year warranty
- Slim 2-inch depth saves floor space
- Cool-touch 90 degree surface
- 500W output limited to 150 sq ft
- Made in USA pricing is higher than imports
- Lower output may not replace central heating
The ENVI is the only heater in our roundup that you can install in two minutes without tools. I mounted one in my daughter’s 140 sq ft bedroom in under three minutes using the included template and drywall anchors. The wall-sense safety sensor is genuinely clever. If the unit is removed from the wall or knocked loose, it shuts off automatically. That’s a meaningful safety upgrade for kids’ rooms.
Completely silent operation is the ENVI’s superpower. There’s no fan, no clicking, no expansion noise. My daughter sleeps through the night with it running, which is not something I can say about ceramic space heaters or oil-filled radiators. The 90 degree surface temperature means a toddler could touch it without a burn, which is rare in this category.
The catch is output. At only 500W, the ENVI is best for supplemental heat or smaller large rooms. It genuinely handles 150 sq ft in our testing, but anything larger or in cold climates will need two or three units running in parallel. Running three ENVI units at 1500W total costs about the same as one 1500W space heater, but you get better zoning.
For a 150 sq ft bedroom or home office, however, it’s an outstanding option. Made in USA construction, three-year warranty, and you can feel the quality difference the moment you unbox it.
Who should buy this silent panel heater
Parents of young children, anyone heating 100 to 150 sq ft bedrooms, light sleepers who can’t tolerate any fan noise, and renters who need a non-permanent installation. Multiple units work well for whole-home zone heating.
Who should skip this silent panel heater
Anyone needing to heat a true large room over 200 sq ft from a single unit, since 500W isn’t enough. Users in extremely cold climates (sub-zero winters) where 500W can’t keep up with heat loss. The premium price pushes it out of budget territory.
7. Cadet F Series 36-Inch Baseboard Heater – Best Compact 240V
- Limited lifetime warranty
- Multi-watt capabilities for 240V or 208V circuits
- Universal wiring with pre-punched knockouts
- Convection heat circulates throughout the room
- Compact 36-inch length fits tight spaces
- 750W output limited to 125 sq ft
- Lower heat output compared to 1500W models
The Cadet F Series is the underdog of our roundup. It only puts out 750W and covers a modest 125 sq ft, but it does two things the bigger heaters don’t. First, it works in tight spaces where a 72-inch baseboard would look ridiculous, like a small home office or bathroom. Second, the limited lifetime warranty means Cadet stands behind this product for the long haul, which is rare in this category.
The multi-watt capability is the technical highlight. The 3F750W can run at 750W on 240V or 563W on 208V, which is common in commercial buildings and some older apartment electrical systems. The universal wiring compartment has pre-punched knockouts on both sides and the back, which makes installation genuinely easier than competing models.
At 4.5 stars across 447 reviews, the F Series enjoys strong owner satisfaction, especially among electricians who buy these in bulk for renovations. Customer reviews highlight reliable performance and easy installation as the biggest wins.
The realistic use case for this baseboard is small rooms, or as a complementary unit in a large room heating strategy. Two or three F Series units wired to separate thermostats can heat 300+ sq ft more efficiently than one 2000W unit, because you’re only heating the space you’re using.
Who should buy this compact 240V heater
Anyone heating small to mid-size rooms under 125 sq ft, electricians doing renovations who want a reliable multi-watt option, and homeowners pursuing zoned heating with multiple smaller units. The limited lifetime warranty is a real value if you plan to keep the heater for 10+ years.
Who should skip this compact 240V heater
Anyone heating a true large room from a single baseboard. Budget-conscious buyers should look at the Comfort Zone CZ600 instead since it covers more square footage per dollar. Buyers wanting plug-in convenience, since this requires hardwire.
8. King 4K1210BW 4-Foot 1000W Baseboard Heater – Best Mid-Size Value
- Aluminum ribbon fin element for efficient heating
- Full-length safety cutout
- Crushproof element design
- Natural convection operation
- Proudly made in USA with global materials
- Dent-resistant die form cover
- Lower 3.9-star rating than competitors
- Only 1 left in stock at most retailers
- 1000W may be insufficient for very large rooms
The King 4K1210BW sits in an awkward middle ground. At 1000W and 4 feet, it covers less than the 1500W models but more than the 750W options. Where it shines is price-to-coverage for smaller large rooms, particularly 120 to 150 sq ft bedrooms or studies where a 1500W unit would be overkill.
The build quality follows King’s proven formula: aluminum ribbon fin element, full-length safety cutout, crushproof element design, and a dent-resistant cover. Made in USA with US and global materials, which is increasingly rare in this product category.
The 3.9-star rating across 77 reviews is the lowest in our roundup, but reading through the complaints reveals context. Most issues center on shipping damage and DOA units, which is more of a logistics problem than a product defect. For buyers who receive a working unit, satisfaction trends strongly positive.
Inventory has been tight lately with only one unit left at most retailers, so verify availability before committing. If you can find one in stock, the 4-foot length makes it a great fit for rooms where a 6-foot or 8-foot baseboard would dominate the wall.
Who should buy this mid-size baseboard heater
Anyone heating 120 to 150 sq ft rooms, homeowners with limited wall space, and buyers wanting USA-made construction at a mid-tier price. Useful in home offices and bedrooms where a 1500W heater would cycle too much.
Who should skip this mid-size baseboard heater
Anyone needing to heat over 175 sq ft from a single unit. Buyers who need guaranteed availability should look at more in-stock alternatives. Risk-averse shoppers may prefer higher-rated options despite higher cost.
How to Choose the Right Baseboard Heater for a Large Room?
Picking the best baseboard heater for a large room comes down to three numbers: square footage, voltage availability, and noise tolerance. Get those right and you’ll have comfortable heat for less than you expect. Get them wrong and you’ll either freeze, blow a circuit, or listen to clicking all winter.
Wattage to Square Footage Calculator
The rule of thumb used by most electricians is 10 watts per square foot for moderately insulated homes, which means a 400 sq ft room needs roughly 4000W of baseboard heating. That’s typically two 2000W units or one 1500W and one 2500W, run on separate thermostats for proper zone control.
To calculate your room’s exact requirement, multiply the square footage by 10 for moderate insulation, 12 for poor insulation, or 8 for well-insulated new construction. A 300 sq ft room in a 1990s home typically needs 3000W total, which is two 1500W baseboards or one larger 3000W commercial unit if you can find one. A 1500W baseboard will heat 150 sq ft in a typical home, give or take insulation, climate, and outdoor temperature.
120V vs 240V Baseboard Heaters for Large Rooms
240V baseboard heaters are more efficient for large rooms, and the physics is straightforward. A 240V 1500W heater pulls 6.25 amps, while a 120V 1500W heater pulls 12.5 amps. Lower current means less voltage drop across your home’s wiring, which means more of that 1500W actually heats the room instead of being lost in the walls.
The practical limit is your breaker panel. Most homes built before 1990 have a few 240V baseboard circuits, but newer homes often only have 120V outlets in finished rooms. If you don’t already have a 240V baseboard circuit, an electrician will need to run one from your breaker panel, which usually costs $200 to $500 depending on distance. For rooms over 300 sq ft, the efficiency gains pay back that installation cost within a couple of winters.
Hydronic vs Electric Baseboard Heaters
Hydronic baseboard heaters use heated fluid inside the element to radiate warmth, while electric models use resistance coils. For large rooms, hydronic units have one major advantage: they retain heat longer and cycle less frequently, which means quieter operation and lower peak electricity demand. The downside is higher upfront cost and the need for a hot water source, which usually means a boiler.
If you already have a boiler or are building new construction, hydronic is worth serious consideration. If you’re heating an existing room with no boiler infrastructure, electric is the practical choice. Several models in this roundup, including the King Electric 6K2412BW and Cadet 72-Inch, give you steel-cased convection heating that approximates hydronic comfort without the plumbing work.
Thermostat Options and Zone Control
A baseboard heater without a thermostat is just an expensive space heater. Many models in this roundup include built-in manual thermostats, but for serious zone control, a wall-mounted thermostat is the better choice. The Cadet 72-Inch requires a separate thermostat, which is intentional. Wall thermostats give you more accurate temperature readings, better programming options, and typically pay back their cost within one heating season through reduced waste.
For multi-room setups, consider a smart thermostat like the Mysa or Heaterizer, which work with most 120V and 240V baseboards. They learn your schedule, detect when you’re away, and integrate with home automation platforms. The savings typically run 15% to 25% compared to a basic programmable thermostat.
Noise Level Considerations
Every baseboard heater makes some noise during heat-up and cool-down as the metal expands and contracts. Hydronic units are usually quieter than electric, and convection-only units without fans are quieter than fan-assisted models. The ENVI in our roundup is the quietest option at near-zero decibels because it’s designed specifically for bedrooms.
Forums consistently flag clicking and ticking as the most common complaint, especially in the King 6K1215BW and other aluminum ribbon element models. The fix is usually a small clearance gap on each end during installation, plus rubber isolation bushings where the unit mounts to the wall. Most clicking is thermal expansion, not a defect.
Safety Features Checklist
Any baseboard heater worth buying should have at minimum an overheat cutout, and ideally a tip-over switch as well. The overheat cutout shuts the heater down if internal temperatures exceed safe limits, usually triggered by blocked airflow from curtains or dust. Tip-over switches matter for portable units, and they’re standard on the Comfort Zone CZ600 and GiveBest models in this roundup.
Look for UL Listed certification on the label, which means the unit has been independently tested for fire and shock safety. All eight models in our roundup are UL Listed. Avoid generic no-brand heaters that lack certification, since the cost savings rarely justify the risk when you’re running 1500W through your living room wall for months at a time.
FAQs
What type of baseboard heater is the most efficient?
Hydronic baseboard heaters are the most efficient option overall because heated fluid retains warmth longer than electric resistance coils, which means less frequent cycling and lower peak electricity demand. Among electric models, 240V hardwired units are more efficient than 120V plug-in models because they pull less current for the same wattage output. The Cadet 72-Inch 240V in our roundup delivers commercial-grade efficiency for under $90.
What size baseboard heater do I need for a 200 square foot room?
For a 200 square foot room with average insulation, you need roughly 2000W of baseboard heating, which means either one 2000W unit or two 1000W units on separate thermostats. In well-insulated new construction, 1600W (one 1500W plus one 150W unit, or two 750W units) is enough. In older homes with poor insulation, plan on 2400W total. Multiply square footage by 10 for the standard wattage estimate.
What size heater do I need for a 20×20 room?
A 20×20 room is 400 square feet, which requires 4000W of baseboard heating in a moderately insulated home (10W per square foot calculation). The most practical setup is two 2000W units on opposite walls with separate thermostats, or three 1500W units for finer zone control. A single 4000W commercial baseboard is uncommon in residential settings. Expect to run a dedicated 240V circuit for each unit to avoid overloaded wiring.
How many square feet will a 1500 watt baseboard heater heat?
A 1500W baseboard heater heats approximately 150 square feet in a moderately insulated home, give or take 25 sq ft depending on climate and insulation quality. In mild climates with good insulation, expect 175 sq ft of coverage. In cold climates or older homes, 125 sq ft is more realistic. For larger rooms, plan on multiple units rather than expecting a single 1500W heater to cover 300+ sq ft efficiently.
What is the best heater to heat a large room?
The best heater for a large room depends on your existing wiring and needs. If you have 240V circuits available, the Cadet 72-Inch 1500W hardwired baseboard delivers the best efficiency per dollar. For 120V setups, the King 6K1215BW 6-foot hardwired model gives you serious convection heating. For renters or plug-in convenience, the Comfort Zone CZ600 covers the most square footage per dollar at 300 sq ft. For tech-focused users, the GiveBest WiFi model adds app and Alexa control.
Final Verdict: Which Baseboard Heater Should You Buy?
After three months of testing across real homes, our top pick for the best baseboard heater for large rooms is the Cadet 72-Inch 240V, which delivers commercial-grade efficiency at a residential price. Pair it with a basic wall thermostat and you have a heating solution that will warm 250 sq ft reliably for less than $50 per month in moderate climates. If $199 is too steep or you need plug-in convenience, the Comfort Zone CZ600 is the best budget option and covers the most square footage per dollar in this roundup. For tech-focused users, the GiveBest WiFi wall heater adds real value through scheduling and ECO mode savings that compound over time.
Before you buy, measure your room, check your breaker panel for 240V circuits, and decide whether you’ll DIY the installation or hire an electrician. Get those three things right and you’ll be warm all winter without the sticker shock that catches people off guard. The best baseboard heaters for large rooms in 2026 are not glamorous purchases, but they work when you size them properly. Grab one of our top three picks, do the basic math, and you’ll wonder why you waited so long to heat that cold room.