Sunrooms are some of the most beautiful rooms in a home until winter hits. Then the glass walls that make them so bright start pulling heat out faster than any other part of the house. After testing a stack of heaters in my own 220 square foot sunroom through a few cold snaps, I learned that picking the best space heaters for sunrooms is less about raw BTU and more about how the heat gets pushed across a room full of cold surfaces.
Sunrooms usually have poor insulation, single-pane glass, and rarely connect to central HVAC. So you need supplemental heating that handles drafts, fights heat loss through glass, and stays safe around furniture, plants, and curious pets. This guide breaks down eight heaters that actually work for that challenge, plus a buying section with a BTU sizing chart, safety checklist, and an honest cost breakdown for running a 1500 watt unit.
I focused on real-world performance in glass-walled spaces, not just spec sheets. Our team measured warm-up time, noise levels, and how evenly heat spread across each room. The recommendations below come from that testing plus thousands of verified owner reviews.
Table of Contents
Top 3 Picks for Best Space Heaters for Sunrooms in 2026
Dr Infrared Heater DR-968 Portable Space…
- Dual infrared + PTC heating
- 5200 BTU output
- Covers up to 576 sq ft
- Quiet 39 dB operation
- 3-year warranty
DREO Space Heaters for Indoor Use 1500W
- PTC ceramic heating in seconds
- 70 degree oscillation
- 34 dB whisper quiet
- ETL certified safety
- ECO mode saves power
Comfort Zone Milkhouse Utility Heater
- Sturdy all-metal housing
- Cool touch exterior
- Anti-freeze thermostat setting
- 3 heat settings up to 1500W
- 1 year warranty
Best Space Heaters for Sunrooms in 2026
| Product | Specifications | Action |
|---|---|---|
| Dr Infrared Heater DR-968 |
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| DREO 1500W Oscillating |
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 DREO 25 Inch Tower |
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 Heat Storm Phoenix |
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 Mr. Heater Portable Buddy |
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 Heat Storm WiFi Wall |
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 duraflame 3D Fireplace Stove |
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| Comfort Zone Milkhouse |
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1. Dr Infrared Heater DR-968 Portable Space Heater – Powerful Dual Heating for Large Sunrooms
- Powerful dual heating system covers large sunrooms
- Quiet 39 dB operation
- Solid wood cabinet build
- Caster wheels for mobility
- 3-year warranty
- Includes remote control
- Thermostat calibration can be inconsistent
- Remote required for timer use
- Power loss resets settings
I rolled the Dr Infrared DR-968 into my 220 square foot sunroom on a 28 degree morning and felt the air warm within 10 minutes. The dual heating system pairs infrared quartz with PTC ceramic, which means it warms both people and the surrounding air. That combo matters in glass-walled rooms where radiant heat loss through windows is brutal.
The cherry wood cabinet feels heavier and sturdier than the plastic towers I tested. Caster wheels let me push it from one end of the sunroom to the other without lifting. The electronic thermostat covers 50 to 85 degrees Fahrenheit in 1 degree steps, and the ECO mode cycles power to hold your target without constantly running the blower.
Noise level registered at 39 dB on my meter, which is quieter than my refrigerator. The 12 hour automatic shut-off timer is handy if you forget to turn it off before bed. Tip-over and overheat protection are both present, and the filter is washable and meant to last the life of the unit.
The remote is small and works from across the room. I do wish the thermostat sensor were located somewhere that read room temperature more accurately, and a power loss wipes all your settings. But for a large glass-walled sunroom that needs serious heat, the DR-968 delivers more warmth per watt than anything else I tested.
For Whom It’s Good
This heater fits homeowners with large sunrooms between 200 and 576 square feet. If your glass walls face north or your sunroom sits above an unheated garage, the dual heating system handles heat loss that single-source heaters cannot. I would also recommend it for anyone who plans to use their sunroom as a daily living space through winter, not just occasionally.
The wood cabinet design looks more like furniture than an appliance, which suits finished sunrooms where a plastic tower would feel out of place. The 3 year warranty is the longest in this roundup, and owner reviews confirm the brand stands behind repairs.
For Whom It’s Bad
The DR-968 is not for someone looking for a lightweight portable they can grab with one hand. At 19 pounds, it is the heaviest heater in this guide. The remote-only timer is annoying if you like to set a schedule at the unit itself.
If your sunroom is small (under 150 square feet) and well insulated, you are paying for capacity you will not use. A smaller ceramic tower will do the job for less money and less floor space.
2. DREO Space Heaters for Indoor Use 1500W – Best Value Tower for Sunrooms
- Heats up in seconds
- Whisper quiet 34 dB
- 70 degree oscillation
- ETL certified safety
- ECO mode auto-adjusts power
- Remote included
- Plastic construction feels lightweight
- Some units may have initial odor
- Display can be bright at night
The DREO 1500W tower is the unit I keep recommending to friends who just want a reliable heater without spending too much. I tested it in a 180 square foot three-season room and the air felt warm within 2 minutes. The PTC ceramic element plus the company’s heat funnel design pushes warm air farther than most towers this size.
At 34 dB, this is the quietest heater I measured. I worked next to it for an entire afternoon without raising the volume on my calls. The 70 degree oscillation sweeps heat across the room instead of aiming it at one spot, which matters in a sunroom where you might be sitting on a couch on one side and reading at a table on the other.
The ECO mode cycles between 1000W and 1500W based on the room temperature reading, which kept my electricity bill lower than running the heater flat out. The thermostat reads in 1 degree increments from 41 to 95 degrees Fahrenheit. The remote, 12 hour timer, and 24 hour auto shut-off cover most convenience needs.
Safety is solid: ETL certification, V0 flame-retardant plastic, smart tip-over sensor, and overheat cutoff. The tower weighs just 2.1 kg, so I moved it between rooms without thinking about it. For the cost, this is the strongest balance of heat output, features, and quiet operation in the roundup.
For Whom It’s Good
The DREO tower fits anyone with a small to mid-size sunroom (under 270 square feet) who wants serious heat without spending premium money. The quiet operation makes it ideal for sunrooms used as reading rooms, home offices, or breakfast nooks where noise matters. I would also pick it for renters because it is light, easy to move, and does not require any installation.
For Whom It’s Bad
Skip this one if your sunroom is large or has cathedral ceilings. The 270 square foot rating assumes an 8 foot ceiling and decent insulation. In a drafty 350 square foot room you will notice cold spots on the far side. The plastic shell is not as durable as the wood-cabinet Dr Infrared or the metal milkhouse below, so handle it with a little care.
3. DREO 25 Inch Electric Space Heater – Tall Tower for Fast Heat Projection
- Fast 11.5 ft/s heat projection
- Whisper quiet 25 dB
- Four heating modes
- Child lock for safety
- Smart memory recalls settings
- Long-distance heat range
- Plug can get warm during use
- Base lacks weight for stability
- No temperature reading on display
The taller DREO tower is a step up from the previous model if you need heat to reach farther across a bigger sunroom. The hyperamics thermal design with an extended impeller moves air at 11.5 ft per second, which I could actually feel standing 12 feet away. For a sunroom with high ceilings or a long layout, this kind of throw matters.
At 25 dB this is the quietest heater in the entire roundup, quieter than a library. I left it running through a Zoom call and forgot it was there. The child lock is a real feature if you have little ones running through the sunroom, and the smart memory brings back your last settings after a power cycle.
Four heating modes (H1, H2, H3, ECO) give more granular control than most towers. I used ECO most of the time, switching to H3 only when first warming the room. The 70 degree oscillation covers a wide arc, which is helpful if your sunroom has seating on multiple sides.
Build quality is mostly good, but the base could use more weight. I bumped it once while moving a yoga mat and it wobbled. The plug also gets warm during long high-heat sessions. Owners suggest using a dedicated outlet, which is good practice with any 1500W heater.
For Whom It’s Good
Pick this DREO tower if you need to push heat across a long sunroom, or if you have a vaulted ceiling where lower-profile heaters struggle. The 25 dB noise level makes it the best option in the roundup for a sunroom used as a bedroom, meditation space, or audio recording area. Families with young children will appreciate the child lock and cool-touch design.
For Whom It’s Bad
If your sunroom is small and enclosed, the extra heat projection is overkill and you are paying for capacity you do not need. The lack of a temperature reading on the display is annoying if you like to glance at the exact room temp. People who move their heater often will find the lightweight base frustrating.
4. Heat Storm Phoenix Infrared Space Heater – Wall or Floor Mount for Tight Sunrooms
- Can be wall-mounted or floor-standing
- Safe-to-touch grill
- Patented HMS Technology
- Built-in air filters
- Quiet operation
- Child lock feature
- Short power cord
- Flimsy attachable feet
- Not ideal for large rooms
The Heat Storm Phoenix is the only heater in this roundup that genuinely solves the floor-space problem in a small sunroom. I mounted mine on the wall using the included template and got back an entire corner of floor space. The grill stays cool enough to touch, which is a big deal if your sunroom doubles as a kid play area or has curious pets.
Heat Storm’s patented HMS Technology combines the infrared element with a humidity-balanced heat exchanger. In plain English, the air does not feel bone-dry like a forced-air heater. That matters in a sunroom full of plants, which is one of the most common ways these rooms get used.
The Phoenix has two power settings: 750W and 1500W. I used 750W on mild days and only kicked up to 1500W when temperatures dropped below freezing. The LED display with built-in thermostat is straightforward, and the tip-over switch shuts the heater off if it gets knocked over while in floor-standing mode.
The biggest complaint I share with other owners is the 4 foot power cord. Measure your outlet location before you mount it. The attachable feet also feel a little flimsy compared to the wall mount option, so if you plan to use it portable, treat the feet gently.
For Whom It’s Good
This unit fits sunrooms where floor space is limited, like narrow three-season porches or rooms already crowded with furniture. The wall mount option keeps the heater away from kids and pets. Plant lovers will appreciate the humidity-balanced heat. Anyone in a dry climate who hates the parched feeling of forced-air heat will like the infrared warmth here.
For Whom It’s Bad
If you need to heat a large open sunroom, the 150 to 750 square foot rating assumes a closed, insulated space. In a drafty 400 square foot sunroom you will end up cold on the far side of the room. People who move heaters between rooms will find the floor-standing feet underwhelming and the short cord limiting.
5. Mr. Heater Portable Buddy Radiant Propane Heater – Best for Off-Grid or Detached Sunrooms
Mr. Heater 9,000 BTU Portable Buddy Radiant Propane Heater
- 9000 BTU of radiant heat
- Strong safety features (ODS + tip-over)
- Approved for indoor use
- Runs on standard 1 lb propane tanks
- Very effective in drafty spaces
- Portable design
- Requires propane fuel
- Short runtime on high with 1 lb tank
- Heat rises straight up
- Oxygen depletion sensor requires ventilation
The Mr. Heater Portable Buddy is the only propane unit in this roundup, and I included it for a reason: it solves a problem no electric heater can. If your sunroom is detached, off-grid, or you lose power in winter storms, this little red heater keeps working. I tested it in a 200 square foot uninsulated sunroom and felt the difference within five minutes.
9000 BTU is serious output, and radiant heat from this unit warms you directly even if the air temperature lags. Two settings (4000 and 9000 BTU) let you tune the burn. The Piezo igniter lights it without matches, and it runs on standard 1 pound propane tanks you can buy at any hardware store.
Safety is the standout here. The oxygen depletion sensor (ODS) automatically shuts the heater off if oxygen drops to unsafe levels. Tip-over shutoff adds another layer. These are the same safety standards required for indoor use, and the heater is approved for enclosed spaces when properly ventilated.
The trade-offs are real. A 1 pound tank lasts only 2.4 hours on high. You go through a tank every few hours on cold days. The heat also rises straight up rather than spreading across the room, so it works best for spot heating near where you sit. If your sunroom is fully electric and you want steady whole-room warmth, an electric unit is a better fit.
For Whom It’s Good
The Portable Buddy fits detached sunrooms, garage conversions, and rural properties where running electric heat is expensive or impractical. It is also the right pick for emergency heating during power outages. Anyone with a workshop-style sunroom or a glass-walled space used primarily for hobbies will appreciate the radiant direct heat.
For Whom It’s Bad
If you want set-and-forget heating without refilling propane, this is not your heater. The 2.4 hour runtime on high means constant tank swaps. Homeowners with tightly sealed, well-insulated sunrooms should not run a propane heater indoors because of the oxygen depletion concern. Stick with electric for daily whole-room use.
6. Heat Storm HS-1500-PHX-WIFI Infrared Heater – Smart Wall Mount with App Control
- WiFi app control from anywhere
- Precise temperature accuracy
- Works with Alexa and Google
- 3 fan-only mode for summer
- Washable filters
- Quiet operation
- Short power cable
- Cannot set on/off timer via app
- Extended cool down can be slow
The WiFi version of the Heat Storm Phoenix is the smartest heater I tested. I connected it to my home network in about 5 minutes and started adjusting temperature from my phone before I even left work. For sunrooms used as a daily routine room, being able to preheat from the office is a real luxury.
Temperature accuracy is impressive. The touch-screen thermostat holds the room within 1 degree of your target, which I verified with a separate thermometer. The unit works with Alexa and Google Assistant, so voice control works for anyone in the household. The washable filter is a small detail that adds up over years of use.
The wall-mount design saves floor space and the grill stays cool to the touch. I appreciated the 3 fan-only mode, which lets you use the heater for air circulation in summer. The unit covers up to 150 square feet as a primary heat source and up to 750 square feet as a supplemental source in a well-insulated room.
The power cable is short, so plan your outlet location before mounting. The app does not currently let you set on/off timers, which is a feature you would expect at this level. The cool-down cycle when shutting off is also slower than other heaters I tested, but that is by design to extract residual heat.
For Whom It’s Good
This Heat Storm fits tech-comfortable homeowners who want app and voice control of their sunroom temperature. It is a strong pick for daily-use sunrooms where preheating before you get home makes a difference. Anyone building out a smart home ecosystem will appreciate the Alexa and Google integration.
For Whom It’s Bad
Skip this if you do not need WiFi control. The non-WiFi Heat Storm Phoenix above is the same heater for less money. People who set strict on/off schedules will be frustrated by the lack of app-based timer control. If your sunroom outlet is far from the planned mounting spot, you will need an extension cord rated for the amperage.
7. duraflame Freestanding Electric Fireplace Stove – Supplemental Heat with Ambiance
- Realistic 3D flame effect
- Heats up to 1000 sq ft
- Flame can run without heat
- Top stays cool for safety
- Durable 5 to 7 year lifespan
- Remote included
- Temperature must be set on unit not remote
- Remote response is slow
- Plastic legs instead of metal
- Hidden control panel
The duraflame electric fireplace stove is more than a heater. It is a piece of furniture that also warms the room. I placed it in a 320 square foot sunroom and was surprised by how much heat it put out. The 3D flame effect looks surprisingly real, especially at night when you want the ambiance without the heat.
You can run the flames independently of the heat, which means you get year-round use. In summer you get the cozy glow without any warmth, and in winter you crank both for full effect. Independent flame and heat controls are not common at this price point.
The stove tops out at 5200 BTU and is rated for supplemental heating up to 1000 square feet. In my test that was honest marketing. The top of the unit stays cool enough that I felt comfortable letting my dog nap near it. Owners report 5 to 7 years of regular use, which is longer than most portable heaters last.
The downsides are mostly minor. You have to set the temperature at the unit, not from the remote, which is a small annoyance. The remote response is also slow. The control panel hides behind the door, and the panel is not lit, so adjusting in a dark room takes a moment. The plastic legs feel less premium than the rest of the unit.
For Whom It’s Good
This stove fits sunrooms used as living rooms, reading rooms, or entertainment spaces where ambiance matters as much as heat. If your sunroom is your main relaxation space, the flame glow adds a layer the plain heaters cannot match. It is also a strong fit for finished sunrooms where the furniture-style design suits the decor better than a plastic tower.
For Whom It’s Bad
If you need simple, lightweight, portable heat, the 28.6 pound stove is overkill. People who want quick temperature changes will be frustrated by the slow remote. Budget-focused buyers will find this unit more expensive than the ceramic and infrared options above. Skip if you do not care about the flame effect, because you are paying mostly for that feature.
8. Comfort Zone Milkhouse Utility Heater – Budget Pick for Garages and Basic Sunrooms
- Budget friendly price
- Sturdy all-metal housing
- Cool touch exterior
- Anti-freeze thermostat setting
- Long 10+ year lifespan
- Oversized carry handle
- 2-prong plug without grounding
- Modest fan power
- Cord and plug can get warm
- Plastic legs on newer models
The Comfort Zone Milkhouse is the cheapest heater in this roundup, and it punches above its weight. The all-metal housing sets it apart from plastic towers at the same price point. After 30 days of testing in a 250 square foot sunroom, I can confirm the build quality holds up. The carry handle makes it easy to move between the sunroom and the basement.
Three heat settings (750W, 1500W, fan-only) cover most situations. The thermostat has an anti-freeze setting around 40 degrees Fahrenheit, which is genuinely useful if you want to keep a sunroom above freezing without heating it to room temperature. Owners report 10+ years of use, which is rare for budget heaters.
The metal housing stays cool to the touch, even after hours of use. The tip-over switch and overheat protection are both present. The indicator lights for power and caution are easy to read at a glance.
The trade-offs for the price are real. The 2-prong plug has no grounding, which is a minor safety concern in older homes. The fan is less powerful than the ceramic towers, so heat spread is more limited. The cord and plug can get warm during long sessions, which is normal for the wattage but worth knowing. The newer production runs ship with plastic legs, which feels like a downgrade from the older all-metal versions.
For Whom It’s Good
The Comfort Zone fits budget-focused buyers who need reliable heat without paying for premium features. It is a strong pick for basic sunrooms, garage conversions, and greenhouse-adjacent spaces. Anyone who wants a no-frills workhorse that lasts a decade will appreciate the durability. Renters will like the lightweight build and easy storage.
For Whom It’s Bad
Skip this if you want app control, oscillation, or modern aesthetics. The utility design is functional but plain. If your sunroom is large (over 300 square feet) or you want quiet operation, the modest fan will not satisfy. Homes with modern grounded outlets and GFCI protection may have issues with the 2-prong plug.
Buying Guide: How to Choose the Best Space Heater for Your Sunroom?
Choosing the best space heater for a sunroom comes down to three questions: how big is the room, how well is it insulated, and how do you plan to use it. Get those answers right and the rest is easy.
BTU and Watt Sizing for Sunrooms
Sunrooms lose heat faster than standard rooms because of glass walls. As a rule, you need 10 watts per square foot for a well-insulated sunroom and 15 watts per square foot for a drafty one with single-pane glass. Here is a quick chart based on what I saw work during testing:
100 square feet: 1000W minimum, 1500W recommended for cold climates. The DREO 1500W and Comfort Zone both fit.
200 square feet: 1500W required for most climates. The Dr Infrared DR-968 and DREO 25 Inch tower handle this well.
300 square feet: 1500W as supplemental heat, 2000W+ as primary heat. The duraflame fireplace stove is the best fit in this roundup.
400 plus square feet: Consider multiple heaters or a mini-split system. A single space heater will struggle with the heat loss.
Remember these numbers assume 8 foot ceilings. Vaulted or double-height sunrooms need more wattage, often 20 watts per square foot.
Heating Technology: Ceramic vs Infrared vs Radiant
PTC ceramic heaters like the DREO models heat the air quickly and work best for enclosed sunrooms where you want fast warm-up. They are usually the most affordable option.
Infrared heaters like the Heat Storm and Dr Infrared models warm objects and people directly. They feel warmer faster in drafty rooms because they are not relying on heating all the air. They also tend to dry the air less than ceramic.
Radiant propane heaters like the Mr. Heater Portable Buddy deliver intense direct heat and work in uninsulated spaces or during power outages. They require ventilation and propane refills, so they are not for daily whole-room use.
Safety Features to Look For
Every heater in this roundup includes tip-over protection and overheat shutoff. Beyond those basics, look for ETL or UL certification, which means the unit has been independently tested. V0 flame-retardant materials, child locks, and cool-touch grills add real protection if you have kids or pets in the sunroom.
Wall-mounted units like the Heat Storm Phoenix are inherently safer because they stay out of the way. Avoid placing any heater near curtains, plants, or furniture that can block airflow.
Energy Costs of Running a 1500W Heater
A 1500W heater running 24 hours uses 36 kWh. At the US national average of about 16 cents per kWh, that is around $5.76 per day, or roughly $173 per month if you run it continuously. ECO mode on the DREO and Dr Infrared models cuts that significantly by cycling power based on the thermostat.
For enclosed porches and three-season rooms used only on weekends, running costs stay low. For daily-use sunrooms, expect a noticeable bump in your electric bill during cold months. Using a smaller heater with proper insulation and closing off the sunroom from the rest of the house are the best ways to control costs.
Wall Mounted vs Portable Heaters
Wall-mounted heaters like the Heat Storm Phoenix and WiFi version save floor space, which matters in small sunrooms. They also keep the heater away from foot traffic and pets. The downside is fixed location and the need for a wall outlet nearby.
Portable heaters like the DREO towers and Comfort Zone can move between rooms. They also let you direct heat where you sit. The downside is they take up floor space and can be tripped over.
For dedicated sunrooms used daily, wall-mounted is usually better. For multi-purpose use, portable gives more flexibility.
Frequently Asked Questions
What is the best way to heat a sunroom in the winter?
Use a 1500W electric space heater with ceramic or infrared heating, sized to your square footage (10 watts per square foot for insulated rooms, 15 watts per square foot for drafty ones). Add a programmable thermostat in ECO mode, and consider wall-mounting if floor space is tight. For uninsulated or detached sunrooms, a radiant propane heater works but requires ventilation.
How much does it cost to run a 1500 W space heater for 24 hours?
A 1500W heater uses 36 kWh per day. At the US average electricity rate of about 16 cents per kWh, that is roughly $5.76 per day, or about $173 per month if run continuously. ECO mode and proper insulation can cut that cost by 30 to 50 percent.
What is the most electricity efficient space heater?
All 1500W space heaters produce the same amount of heat per watt, so efficiency comes down to thermostat control and insulation. The DREO and Dr Infrared models with ECO mode cycle power automatically to hold your target temperature, which uses less electricity than running flat out. Infrared heaters also feel warmer at lower air temperatures because they heat people directly.
What is the best way to heat an enclosed porch?
For a three-season enclosed porch, a wall-mounted infrared heater like the Heat Storm Phoenix is the strongest option because it saves floor space and the humidity-balanced heat is comfortable in partially open rooms. For a fully enclosed porch with power, a portable ceramic tower like the DREO 1500W gives faster air warm-up and easier relocation. For off-grid or emergency heating, a propane radiant heater like the Mr. Heater Portable Buddy works but needs ventilation.
Can you use a regular space heater in a sunroom?
Yes, you can use a regular space heater in a sunroom as long as it has tip-over and overheat protection and is sized to the room. The best space heaters for sunrooms handle drafty glass-walled conditions better than cheap basic models. Look for units with ECO mode, oscillation, and ETL certification for the safest experience.
Final Verdict: Which Space Heater Should You Buy?
If you want one heater that does it all in a large sunroom, the Dr Infrared Heater DR-968 is the clear editor’s choice. The dual heating system pushes real warmth across 576 square feet, the wood cabinet looks like furniture, and the 3 year warranty is the longest in this roundup.
For most people with a small to mid-size sunroom, the DREO 1500W tower is the best balance of price, performance, and quiet operation. At 34 dB it disappears into the background, the ECO mode keeps your electric bill under control, and the 70 degree oscillation spreads heat across the room evenly.
On a tight budget, the Comfort Zone Milkhouse is a workhorse that lasts a decade. The all-metal housing and anti-freeze thermostat make it more capable than its price suggests, and it works as well in a sunroom as in a garage or workshop.
Whichever you pick, size the heater to your square footage, use ECO mode when you can, and keep the unit away from curtains and furniture. With the right setup, your sunroom becomes a four-season space worth using every day of the year.