VanThermia · Guides for considered choicesUnited States · Selection for your market
Camper van interior at dusk with mountains outside.

Camper Van and RV Heating, Cooling and Insulation, Compared Clearly

Compare heating, ventilation, cooling and insulation for your RV power supply and space. Check the requirements before installation.

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United States · Offers for your marketHow we choose

Comfort on the scale of your camper.

VanThermia compares heating, air conditioning, ventilation and insulation for camper vans, RVs and travel trailers using the numbers each manufacturer publishes. For most people the order is: insulate, fit a small diesel heater with its exhaust outside, and add a carbon monoxide alarm. Air conditioning depends on your battery bank or the campground hookup.

Start with what you want to solve

Compare the differences that change your choice before checking an offer.

Heating

The best diesel heaters for camper vans and RVs in 2026: 7 fixed and all-in-one units ranked on specs, with the fuel math that exposes inflated kW claims.

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Air conditioning

The 4 best portable air conditioners for camper vans and RVs, all with real compressors, ranked on cooling per watt, venting, noise and heat mode.

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Ventilation

The 6 best dehumidifiers for RVs and camper vans in 2026, compared on real daily capacity, type (desiccant or Peltier), cold-weather use, power and noise.

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Your space. Your use. Your priorities.

Explore by category to narrow down models and requirements.

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Models to compare with confidence

Use cases, differences and limits of the selection. Open a profile to decide and the retailer to check current conditions.

Check the current price, availability, variant and purchase conditions with the retailer.

Installation starts before you buy.

Available space, power and safety requirements constrain the equipment. Check the guides, calculations and instructions for the exact variant.

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Understand what really matters

Our method

How to Install a Diesel Heater in a Camper Van or RV

How to plan a diesel heater install in a camper van or RV: location, exhaust and intake outside, fuel, wiring, CO alarm, paperwork, and when to hire a pro.

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What Size Heater Do I Need for My Camper Van or RV?

Work out how many kW or BTU your camper van or RV heater needs from volume, insulation and outside temperature, and spot inflated diesel heater ratings.

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Carbon Monoxide in Camper Vans and RVs: Sources, Symptoms and Alarms

Where carbon monoxide comes from in a camper van or RV, the NHS symptoms, what to do, UL 2034 vs EN 50291-2 alarms and where to fit one.

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What is VanThermia?

VanThermia is an independent comparison site about staying warm and cool in camper vans, RVs, travel trailers and caravans. We read the official Amazon listings, pull out the figures each manufacturer states and put them side by side.

Then we do the math the listing skips: whether a heater’s output matches its fuel use, how many amps a 12 V air conditioner draws, or what fits on a 30 A pedestal. We always show the formula.

What do you need?

To compare options before choosing, browse all rankings and product reviews and comparisons.

Where should you start?

With insulation: everything else works better in a well-insulated rig. Closed-cell foam or fiber batts cut heat loss and condensation, so a smaller heater and a lower-draw AC will do.

Then heating. Work out how much output you need with what size heater do I need: a well-insulated high-roof van rarely needs more than 2 kW (about 6,800 BTU/h). If you fit a diesel heater, read how to install a diesel heater first.

Which calculators do we offer?

What about condensation?

Condensation is the number one winter problem in campers. The EPA recommends keeping indoor humidity below 60%: ventilate, insulate without thermal bridges and use dry heat. We explain it step by step in camper condensation.

How do we review?

Every product gets a VanThermia score out of 10 from a public formula: it starts at 5 and earns points for what the listing states, such as a remote, a low-oxygen sensor or closed-cell insulation. Missing data adds nothing and impossible figures cost points. We cover Amazon.com (US); UK and Canada visitors are sent to their local store only when we have verified the same product there. Details in how we review and about us.

Practical guides

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All models

Browse the 73 products in the US catalog, with specifications and links to comparisons.

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Frequently asked questions

What is the best heater for a camper van?

For off-grid winter nights, a diesel air heater is the most common choice: it sips fuel and gives dry heat. On shore power, a low-wattage electric heater is a good backup.

Is a propane heater safe in a camper?

Only models the maker rates for indoor use, with a low-oxygen sensor and tip-over shutoff, and only with the ventilation opening the manual requires. Never sleep with one running, and always have a CO alarm.

Can I run air conditioning without shore power?

Yes, with a 12 V rooftop or parking AC or a compressor portable unit, but they draw a lot of battery. Check your watt-hours first with our RV power calculator.

Do you physically test the products?

No. We analyze the official listings, compare the data and show our math. When a listing leaves something out, we say so. Our method page explains it.

How does VanThermia make money?

Through the Amazon Associates program: if you buy through our links, Amazon pays us a commission at no extra cost to you. No brand pays to appear or to rank higher.