As we think about the dog days of summer, we’ve gotta talk about staying cool in hot weather. We recently published a post with 11 tips on how to keep an RV cool in summer. We’ve also got a post on 6 tips to try if your RV AC is not cooling. But this post features some ideas for how to keep yourself cool, particularly if you can’t use AC. So, read on for some thoughts on how to stay cool in an RV without air conditioning.
- 1) How to Keep RV Cool Without AC: Don’t All RVs Have Air Conditioning?
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2)
How to Stay Cool in an RV Without Air Conditioning: Tips for Keeping Your RV Cool
- 2.1) Fans
- 2.2) Mist or Wet Cloth
- 2.3) Go Barefoot
- 2.4) Wear a Wet or Frozen Neck Gaiter
- 2.5) Ice Packs or Frozen Water Bottles Under Pillows
- 2.6) Cool Cotton Sheets
- 2.7) Use Your Roof Vent Fans to Expel Hot Air
- 2.8) Cover Windows & Skylights During the Day
- 2.9) Stay Well Hydrated
- 2.10) Shower in Cool Water Before Bed
- 2.11) Strategies for Reducing Heat Gain
- 3) Cooking and Cooling
- 4) What Measures Do You Take to Stay Cool in the Extreme Heat?
How to Keep RV Cool Without AC: Don’t All RVs Have Air Conditioning?
While many RVs do have air conditioning, several types of RVs don’t offer this feature.
Moreover, some RVers’ air conditioning systems aren’t working for one reason or another. They don’t want the lack of AC to stop them from traveling, but they do need some tips for staying cool in the summer heat.
And finally, there are many RVers who aren’t able to run their AC unless they’re connected to shore power. For those of us who love boondocking, that’s a limitation we don’t want holding us back, so we’re happy to find alternative ways to stay cool when necessary.
Types of Air Conditioning Systems in RVs
When it comes to keeping your RV cool, understanding the different types of air conditioning systems available is crucial. There are several types of air conditioning systems used in RVs, each with its own set of advantages.
- Roof-Mounted Air Conditioners: These are the most common type of air conditioning system used in RVs. Installed on the roof, they provide cooling to the entire interior, making them ideal for larger RVs. Roof-mounted air conditioners are powerful and efficient, ensuring that you stay cool even in some fairly extreme heat.
- Window-Mounted Air Conditioners: Good for smaller RVs or for providing supplemental cooling to a specific area, window-mounted air conditioners are compact and easy to install. They fit into a window and can be a great addition if your RV’s main air conditioning system needs a little extra help. Because these units require setup and stick out the side of an RV, they’re most commonly used in rigs that are parked permanently in one location.
- Portable Air Conditioners: These self-contained units can be moved from room to room, offering flexibility and convenience. Portable air conditioners are ideal for RVs that don’t have a built-in air conditioning system. They’re easy to set up and can be a lifesaver when you need to cool down a specific area quickly.
- Swamp Coolers: Also known as evaporative coolers, these systems use evaporation to cool the air. Swamp coolers are particularly effective in dry climates and can be an energy-efficient alternative to traditional air conditioning systems. They work by drawing in warm air, passing it through water-saturated pads, and expelling cooler air into your RV.
The roof air conditioner on our new Outdoors RV 19MKS travel trailer keeps our rig (and us) nice and cool. We even installed enough solar and Battle Born lithium batteries to run it when we’re off the grid.
By understanding these different types of air conditioning systems, you can choose the best option for keeping your RV cool and comfortable, no matter where your travels take you.
How to Stay Cool in an RV Without Air Conditioning: Tips for Keeping Your RV Cool
So, let’s talk about keeping yourself cool when you’re inside an RV without the option to use air conditioning, and the ambient temperature is HOT. These tips will help you keep your camper cool even in the hottest weather.
Fans
Perhaps the most obvious suggestion for how to stay cool in an RV without air conditioning is to use fans to cool yourself as well as to cool your rig. Fans can help circulate cold air throughout the RV, providing relief from the heat.
The most common fans to use while camping are either 12V fans or battery-operated fans.
One of the most popular 12V/24V options among RVers and boaters alike are these Sirocco cabin fans by Caframo. They offer a low current draw, 360-degree directional airflow, 12V/24V auto-sensing, 3 speed settings, and 4 timer settings. They’re easy to install and can fold flat up against a wall when not in use.
- 185 CFM on high (314 m³/hr), Current draw on low 0.06A (24V) and 0.12A (12V), Current draw on high 0.21A (24V) and 0.35A (12V).
- Unique gimbaled design allows complete 360° airflow with ultra quiet operation (54dB on high).
Caframo also makes a grill-free 12V option in its Ultimate 757. These compact cabin fans also draw low current and offer 360-degree directional airflow with a tilting head and finger-safe blades. They’re good for tight spaces and tap into the RV’s electrical system.
- Compact, grill-free cabin fan with patented Finger Safe blade
- 2 Speed settings for maximum comfort
There are also 12V options that plug right into any 12V outlet rather than needing to be installed in one location in the RV.
One such option is this Boundless Breeze RV/marine fan with three settings. Note that reviewers state that while this unit does move a significant amount of air, it does so at the expense of a fair amount of noise:
- Perfect for your RV, car, boat and more
- Ten powerful blades offer quiet operation even at high speeds
Then there are the small, clip-on style 12V fans which can be moved from location to location as necessary. These also plug into any 12V outlet and have the option to oscillate.
- COOLING POWER: Effective air circulation for cooling cars, trucks, buses, RVs, or boats; works with your vehicle outlet
- QUIET OSCILLATION: Quiet, reliable air flow and oscillating motion for full-coverage cooling
And finally, there are a number of battery-operated fans available as well. As always, it’s important to read reviews at all levels to make sure you’re not getting a fan that requires new batteries every day.
These small portable fans are available in 5-inch and 10-inch options and are good for laying a cool breeze on you wherever you are. They fold and store easily and operate on the power of a couple of D-cell batteries (not included), and tend to have good reviews.
- BATTERY POWER FAN - This 5-Inch portable fan from Treva runs on 2 D batteries (not included), cool gadgets for an awesome office desk accessories or...
- COMPACT DESIGN: This mini fan won’t take up much space and features a convenient folding design, so you can use it as a window fan or travel fan to...
- BATTERY-OPERATED POWERFUL PORTABLE FAN : With Treva’s 10" popular Fan, you can cool off wherever you are. Perfectly sized at 12.00" x 3.80" x...
- DURABLE CONSTRUCTION: This desk fan is durably crafted using sturdy plastic construction for long-lasting use with a patented fan blade design which...
There are so many options for fans that we should probably do a post just on 12V fans at some point. But for now, you’ve got a starting point if you’re interested in looking into fans as a means of staying cool in your RV without air conditioning.
Now here’s the real trick where fans are concerned…
Mist or Wet Cloth
In order to increase the cooling effect of a 12V or personal battery-operated fan, misting yourself with water or wiping your skin down with a wet cloth and then allowing a fan to blow over you can actually make you feel cold!
Of course, you could also just mist yourself or wet down your skin and that may be enough to keep you cool. But if you find yourself in a situation where there’s just no getting away from the heat, wet your skin and allow a fan to blow over you. You’ll cool down for sure. Alternatively, using an evaporative cooler can also enhance the cooling effect in dry climates.
Go Barefoot
This may go without saying, but we’ll say it anyway. Wearing socks, slippers, or shoes of any type will help keep your body warm. Allowing your feet to stay cooler really does help to keep your whole body cooler overall.
In fact, some people swear by putting clean cotton socks in the fridge or freezer to get them nice and cold, and then putting them on to cool their feet so much that it helps cool their entire body down, too.
When it gets hot, taking your shoes & socks off and going barefoot can really help cool you off!
Wear a Wet or Frozen Neck Gaiter
Those of us who hike are likely familiar with neck gaiters and buffs. These are tubes of material that are useful as sun or wind protection, but when wet they can act as a fairly significant cooling agent.
Wet the neck gaiter or buff to the degree that you have to wring it out. Either wear it like that or place it in the fridge or freezer for a while and then put it around your neck.
If you’re in very hot, humid weather, you may want to keep a few in the fridge so you’ll have some ready when the one you’re wearing dries out.
For those unfamiliar, these are neck gaiters and buffs:
- COOL MORE. DO MORE Enjoy staying active longer & doing what you love even when the temperature rises with the cooling & refreshing MISSION Cooling...
- COOLS INSTANTLY When activated with water it cools to 30 degrees below average body temperature in under 30 seconds! Activate quickly in 3 steps Wet...
- 4-way stretch
- Sport Type: outdoor lifestyle
- Sport Type: Outdoor Lifestyle
Ice Packs or Frozen Water Bottles Under Pillows
Many people swear by the cooling effect of a frozen ice pack or water bottle under their pillow on hot nights. Having a frozen ice pack or bottle nearby could certainly be helpful if you use it to cool your skin down as well.
Beware that if you’re freezing a bottle of water, you don’t want it to be more than ¾ filled with water when you put it in the freezer, as overfilled bottles can burst.
Also, be sure to keep the potential for condensation in mind, and consider wrapping the bottle or ice packs in a towel to prevent them from getting you, or your bedding, all wet.
Cool Cotton Sheets
Choosing cool cotton sheets is always important in summer, especially when you’re thinking about how to stay cool in an RV without air conditioning. If you’ve still got your flannel sheets on your RV bed, exchanging them for breathable cotton sheets will make more of a difference in keeping you cool than you may think.
- Pure Cotton, Exceptional Quality: Our 100% cotton sheets for ful bed feature a classic percale weave that’s cool, crisp, and feels smooth against...
- Slip into Ultimate Comfort: Woven from the finest 100% cotton fibers, our percale bedsheets keep you cozy all night long. Certified by STANDARD 100 by...
- WINNER GOOD HOUSEKEEPING 2023 BEST BEDDING AWARD!: Our certified 400-thread count soft & comfortable 100 percent cotton queen white sheets are crafted...
- WELL SIZED BED SHEET SET WITH DEEP POCKET: Our 4-piece bedding sheets & pillowcases set includes 1 top sheet, 1 deep pocket fitted sheet with an...
Use Your Roof Vent Fans to Expel Hot Air
The roof vent fans in an RV offer an amazing amount of cooling ability when used in the proper manner for cooling the RV. The type with full-size fan blades that cover the entire opening move the most air.
The best way to use your roof vents to cool your RV is to run the fan so that it’s pulling air OUT of the RV, and crack open a window (or several of them) elsewhere in the rig. This allows air to flow through the RV, cooling the living space.
Some RV vent fans have the ability to blow in or out. In some circumstances, if the outside air is cool, you may want to draw the cool air into the RV. But if your goal is to cool the rig using the vent fan almost as a lightweight air conditioner, you’ll want the fan’s air blowing out, with at least one window cracked open.
Be sure to keep your vent fans clean for maximum effectiveness:
Cover Windows & Skylights During the Day
The sun coming into an RV through windows and skylights during the day can leave the interior pretty hot. Blocking the sun can be helpful, especially during the hottest part of the day. Switching to LED lights can also help reduce heat buildup inside your RV.
Just as shade is cooling, so is providing shade to the rig’s interior by blocking the windows and any skylights from the sun.
With motorhomes, the windshield is often the single largest source of heat. Keeping it covered with a windshield screen is one of the most basic steps you can take to keep heat out. Parking the rig facing North to avoid direct sunshine on the windshield is a good idea as well.
A simple way to block your windows is to use a product like Reflectix (or another “bubble wrap insulation” product). These conform to just about any window shape and are lightweight and easy to store.
- Item Weight: 4.6 lb
- Country of Origin: China
There are products that insulate skylights from the sun’s heat as well. These are inexpensive and well worth using in both hot and cold weather.
- RV Vent Reflective Insulation: Camco’s vent insulator blocks the sun's damaging rays. It helps keep your RV cooler in the summer and warmer in the...
- Saves Energy: This product reduces heat transfer and increases A/C efficiency.
Stay Well Hydrated
It’s always important to drink water, but it’s essential to replenish lost fluids in the heat of summer. This is true for so many reasons, not the least of which is the fact that your body can more efficiently cool itself if it is well-hydrated.
In order to cool itself, your body perspires. It’s ingenius, really, but it doesn’t work as well if you’re dehydrated. Your mother was right: hydrate, hydrate, hydrate!
Shower in Cool Water Before Bed
If you have the opportunity to shower while you’re camping, doing so in cool (but comfortable) water before bed helps to cool your body before you go to sleep.
If you can’t shower before bed, even wiping the day’s “stuff” away and cooling the body with a wet cloth can be very helpful.
Many campers who aren’t able to shower daily use a product like these disposable washcloths to wash and cool the body prior to going to bed on those hot summer nights. They work, and they save water if you’re boondocking or just don’t have access to a shower.
- Stay Fresh and Clean Anywhere with Extra Thick Body Wipes for Adults Bathing No Rinse. Designed to maintain hygiene when showering isn't possible,...
- Combat Sweat, Dirt, and Body Odor. Our bath wipes for adults bathing no rinse are formulated with tea tree oil and chamomile for a deodorizing and...
Taking a cool shower can definitely help you beat the heat in your RV.
Strategies for Reducing Heat Gain
Reducing heat gain is an essential part of keeping your RV cool, especially during the scorching summer months. Here are some effective strategies to help you minimize heat gain and maintain a comfortable interior temperature.
- Use Window Coverings: Curtains, blinds, and shades can block out direct sunlight and significantly reduce heat gain. Opt for reflective or blackout materials to maximize their cooling effect.
- Install Reflective Insulation: Reflective insulation can be installed on the roof and walls of your RV to reflect sunlight and heat away from the interior. This simple addition can make a noticeable difference in keeping your RV cooler.
- Deploy Awnings: Awnings provide shade for your RV, reducing the amount of direct sunlight that hits the exterior. This can help lower the temperature inside your RV and create a more comfortable living space. This can depend on which side your main awning is in relation to the sun and is one reason we usually face East when boondocking.
- Ensure Proper Ventilation: Good ventilation is key to expelling hot air and bringing in cooler air. Use roof vent fans, open windows, and even portable fans to improve air circulation and keep your RV cool.
- Utilize Cooling Products: There are various cooling products available, such as cooling towels, scarves, and bandanas. These items can help keep you cool by providing a refreshing burst of cooler air when you need it most.
By implementing these strategies, you can effectively reduce heat gain and enjoy a more comfortable RV experience, even in the hottest weather.
Cooking and Cooling
Cooking in an RV can be a challenge, especially during hot weather. The heat generated from cooking can make your RV feel like an oven. Here are some tips for cooking and cooling in your RV to help you stay comfortable.
- Cook Outside: One of the best ways to reduce heat gain in your RV is to cook outside. Use a portable grill or outdoor stove to prepare your meals without heating up the interior of your RV.
- Use a Microwave: Microwaves are a great way to cook meals quickly and efficiently without generating a lot of heat. They are perfect for reheating leftovers or preparing simple dishes.
- Opt for a Slow Cooker: Slow cookers are ideal for meals that need to simmer for a long time, such as stews and soups. They generate less heat compared to traditional stovetops and ovens, helping to keep your RV cooler.
- Utilize a Thermos: Thermoses are excellent for keeping drinks hot or cold for hours. They can reduce the need for constant refrigeration and help maintain a cooler environment inside your RV.
By following these tips, you can enjoy delicious meals without turning your RV into a sauna. Keep your RV cool and comfortable while still enjoying the pleasures of cooking on the road.
If your RV is equipped with one, using the outdoor kitchen is a great way to keep the heat of meal prep out of the interior.
Ways to Cook Outside Your RV to Avoid Heat Gain
Cooking outside is a fantastic way to avoid heat gain in your RV. Here are some tips for making the most of outdoor cooking:
- Use a Portable Grill: Portable grills are perfect for cooking outside and can handle a variety of meals, from burgers to vegetables. They are easy to set up and pack away, making them a convenient option for RVers.
- Try an Outdoor Stove: Outdoor stoves are great for meals that require high heat, such as stir-fries and skillet dishes. They allow you to cook efficiently without adding heat to your RV’s interior.
- Bring a Camping Stove: Camping stoves are versatile and portable, making them ideal for cooking in the great outdoors. They can be used to prepare a wide range of meals, from breakfast to dinner.
- Experiment with a Solar Oven: Solar ovens use the sun’s energy to cook food, making them an eco-friendly and heat-free cooking option. They are perfect for slow-cooking meals like stews and soups, and they work well in sunny conditions.
By taking your cooking outside, you can keep your RV cool and enjoy the fresh air. These outdoor cooking methods are not only practical but also add an element of adventure to your RV lifestyle.
What Measures Do You Take to Stay Cool in the Extreme Heat?
We’ve shared some tips for how to stay cool in an RV without air conditioning, but we certainly haven’t shared them all. What have you done to stay cool in the dog days of summer at times when you haven’t had access to RV AC? Please share your tips in the comments section below.
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Mary Warns
Monday 12th of May 2025
we haven't done this in the camper (yet), but when first married, 45 years ago, central air wasn't affordable for our home etc. we did have fans and put trays of ice water infront of them for the air to cool as it blew over. our dumpy, smaller than a 2 car garage (but it was ours, and we could fix it up) stayed cool. AND I was 8 months pregnant in 100 degree heat. It was a the swamp cooler premise. having extra ice cubes the next summer was great for daquiris!
Jonathon Osborne
Friday 31st of May 2024
My new fan is USB rechargeable, reasonably quiet and powerful. It's a Koonie, (think Toonie with a K) that I got on Amazon. It has 4 speeds and a strong clamp. My other fan is an Autotrends USB fan from Canadian Tire. It's 2 speed and quiet and shaped like a little barrel. I also have a cooling blanket that draws away body heat, moreso if it's put in the fridge or damp. I bought a cooling pad for my cats, which they refuse to lay on, so I use it on my pillow. For hydration, I have plenty of water bottles, my latest being the ThermoFlask from Costco. I haven't used these in my minivan yet, but I live in the desert, so they will get used. And I have a countertop ice maker that I can run with my 800W Bluetti. :) It gets used a lot in my house. When it's hot, my cats demand ice in a bowl to lick.
Larry
Saturday 3rd of June 2023
U. S. Air Force desert survival training has proven the benefit of placing a wet cloth on each forearm and replacing the water as necessary to keep the cloth moist. In through testing they found that covering more of the body (such as an entire t-shirt) would risk overcooling which triggers the central body to start generating heat! Heat generation was also easily triggered by drinking cold beer (not that they recommended drinking warm beer! Nor did they say where to get cold beer in a desert survival siruation). I have personally tested the moist-cloth-on-forearm technique and have found it to be surprisingly effective even without adding a fan in a low humidity environment, such as the desert in Arizona, and also very helpful even in the somewhat humid summer heat of Lubbock, Texas. In Lubbock adding a fan boosted the cooling effect sufficient to halt my sweating.
TheRVgeeks
Saturday 3rd of June 2023
Can't wait to test this out. Thanks for providing some USAF survival training guidance, Larry!
Ro Bennett
Friday 2nd of June 2023
I made insulated/blackout window inserts (numerous YouTube DIY videos). We also use thermal-backed curtains on a tension rod room divider to partition off the cab (which can be closed while driving so the dash AC is more efficient while driving). Both of these definitely help with keeping the RV cooler in summer and warmer in winter.
I also made cooling neck wraps using Orbeez water beads. Keep them in the refrigerator. Cooling lasts a long time.
TheRVgeeks
Saturday 3rd of June 2023
Great tips, Ro. Thanks for sharing!
George Carrington
Friday 2nd of June 2023
As a former Letter Carrier for the Postal Service I would get a water-tight container, fill it up half way with water the night before, and put it in the freezer. The next morning I would fill it up the rest of the way and put a wash cloth in it. During the heat of the day I would take that cool/cold wash cloth out and wipe myself down with it. VERY refreshing!
TheRVgeeks
Saturday 3rd of June 2023
Sounds like a great solution, George!