Quick answer
Yes — you can heat an RV without propane, and the honest version of that answer has a boundary at about 36°F. Above it, a 12V reverse-cycle heat pump heats straight off the battery bank — the Glacier Pro delivers 8,500 BTU on 12V at a variable draw of up to 55A, with no fuel, no inverter, and no shore power. Below about 36°F, propane-free means diesel, not battery: the heat pump throttles itself to roughly 20A to protect its compressor, while our 5 kW diesel heater makes its heat from fuel and is rated to -40°F, with the battery running only its fan and pump.
The battery math is the part nobody prints: at the heat pump's 55A rated maximum, a 230Ah bank is about 4 hours of ceiling-case arithmetic, a 460Ah about 8, a 630Ah about 11 — real draw runs lower once the cabin is at temperature — and any bank that runs it needs a BMS rated for 100A continuous.
Below: why propane-free is a realistic build in 2026, the two heat sources compared honestly, the temperature-band decision table, the heating battery math, the fall recharge problem, the stacks we actually recommend, and the limits we won't sugarcoat.
| Propane-free heat source | Heat output | 12V draw | Works down to | Best for |
|---|---|---|---|---|
| Glacier Pro reverse-cycle heat pump | 8,500 BTU (12V model; 12,000 BTU on 110V) | Variable, max 55A; drops to ~20A in low-ambient protection | Effective above 36°F (2°C) | Shoulder-season nights in the 40s without burning fuel |
| OutEquipPro 5 kW diesel heater | 5 kW (≈17,000 BTU/h) | Fuel makes the heat; battery runs fan, pump, and startup only | Rated to -40°F | Freezing nights, winter, primary heat |
1. Why "no propane" is a realistic build in 2026 — and what it actually asks of you
Propane-free RV heating stopped being a compromise once lithium banks got big enough to run a rooftop unit overnight; what it asks of you now is a real LiFePO4 bank, a heat source matched to your coldest realistic night, and honesty about the 36°F line. Builders go propane-free for different reasons — no combustion fuel system inside the living space, no tank to certify and mount, no hunting for a refill station on a Sunday, or simply a van that never had a propane locker to begin with. Whatever the reason, the physics doesn't care: heat still has to come from somewhere, and on a 12V system there are two places it can come from — a heat pump that moves outdoor heat indoors on battery power, or a diesel air heater that makes heat from fuel.
One of those lives on your roof. The Glacier Pro's heat pump runs directly off the battery bank — no inverter, no shore power, no fuel. The other is a dedicated diesel air heater, and it's the one our support team reaches for whenever a customer describes freezing nights: pairing a 12V rooftop unit for cooling with a dedicated diesel heater is, in our support files' words, the most stable and effective real-world solution, used by many of our customers for year-round comfort. Everything below is about deciding where your trips fall between those two.
2. The two heat sources, honestly compared
A heat pump moves outdoor heat indoors and multiplies what each amp buys you — until the outdoor air runs out of heat to move — and a diesel heater sidesteps the battery entirely by making heat from fuel. Here's each one the way we describe it to customers.
The reverse-cycle heat pump (Glacier Pro)
The Glacier Pro runs its refrigeration loop in reverse, pulling heat out of the outdoor air and releasing it inside: 8,500 BTU of heating on the 12V model (12,000 BTU on the 110V version), alongside 11,500 BTU of cooling. Heating draw is variable — it auto-adjusts to ambient temperature and set point, up to a rated maximum of 55A — and typically runs lower once the cabin is holding temperature. There are no fixed Turbo/Eco/Sleep heating modes; the system decides.
That efficiency is real, and it has a floor: the heat pump stops working effectively below about 36°F (2°C). What actually happens below that line, from a documented support case: the controller detects low evaporation pressure and throttles the compressor down to roughly 20A to prevent liquid refrigerant from reaching the compressor — a protection mode, not a shutdown — and the outdoor coil starts frosting, forcing defrost cycles that blow neutral air. Low draw in freezing weather is the unit protecting itself, not saving you battery. For environments at or consistently below ~36°F, our support team recommends a dedicated diesel heater as the primary heat source, with the Glacier Pro handling cooling and mild-weather heating. (Cooling performance is identical between the heat-pump and cooling-only Glacier Pro variants — skipping the heat pump sacrifices no AC quality, and the heat pump cannot be added to a cooling-only unit later, so decide at purchase.)
The diesel air heater (OutEquipPro 5 kW split)
Our 5 kW split diesel heater ($349) is the propane-free answer to real cold. It burns 0.10–0.40 liters of diesel per hour, is rated to operate from -40°F to 104°F and up to 16,400 ft, weighs 10.58 lbs, and is controlled by an LCD panel, a Bluetooth app, or the remote, with a 24-hour programmable timer. It ships with a complete installation kit — ducts, exhaust, fuel lines, harness, pump, and mounting bracket — and no tank: it plumbs to your vehicle's diesel tank or an external container. The battery-side story is the whole point: the fuel makes the heat, so the electrical load is the fan, the fuel pump, and the glow-plug startup — a fraction of what any electric heat source pulls. We don't publish a running-amps figure for it here because that number isn't in our spec file yet; what we can say from our support files is that it does not rely on high electrical current to generate heat, which is exactly why it is the primary source we recommend for overnight use in true winter conditions.
3. The decision table: pick by your coldest realistic dawn, not your average night
Choose the heat source for the coldest overnight low you actually camp in — not the average — because the 36°F line is a physical boundary, not a preference. Every propane-free build we've helped plan lands in one of three bands:
| Coldest overnight low on your real trips | Propane-free answer | Why |
|---|---|---|
| Above ~45°F | Glacier Pro heat pump — or good bedding and no heater at all | Bedding handles the night; a short morning heat-pump run takes care of the get-up warm-up at its most efficient. If you only need heat a few mornings a year, the diesel heater's timer does the same job on a cooling-only rooftop unit. |
| ~36–45°F | Glacier Pro heat pump | This is the heat pump's home turf: real heat, variable draw, no fuel. Size the bank for the night (§4). |
| Below ~36°F | 5 kW diesel heater as primary; rooftop unit for cooling and fan circulation | The heat pump throttles into protection mode; the diesel heater doesn't care how cold it is. Use the rooftop unit's fan mode to distribute the diesel heat through the cabin. |
If you already own a propane furnace and a big rig, keep it — we're not going to tell you to rip out a working heater. This table is for the builder deciding what to put in.
4. The battery math: what heat-pump heating actually costs a bank
Heat-pump heating has no fixed mode to divide by, so plan the bank on the 55A rated maximum and treat everything the variable draw saves you as margin — and check the BMS before you check the amp-hours.
Ceiling-case arithmetic (nameplate Ah ÷ 55A rated max):
| Battery bank | Heating at the 55A ceiling | Same bank in Eco cooling (Glacier Pro, 30A) |
|---|---|---|
| OutEquipPro 230Ah (from $585, ~2.7 kWh) | ~4 hours | ~7.5 hours |
| OutEquipPro 460Ah Smart Power Hub (~5.8 kWh) | ~8 hours | ~15 hours |
| OutEquipPro 630Ah Smart Power Hub (~7.5 kWh) | ~11 hours | ~21 hours |
Two honest notes on that table. First, it's arithmetic, not a measured runtime: the heat pump's draw floats between its ~20A protection floor and its 55A maximum depending on outdoor temperature and set point, and it typically runs below peak once the cabin is at temperature — so a mild night in the high 40s will beat these figures, and a night near the 36°F floor will approach them. Second, don't count the ~20A protection-mode draw as efficiency; it's low draw and low heat.
The BMS trap. A 55A heating draw (and the Glacier Pro's 62A Turbo cooling draw) will trip a standard 50A BMS regardless of the battery's amp-hour rating; the requirement is 100A continuous, and no amount of capacity substitutes for it. Our 230Ah runs a 200A continuous BMS; the 460Ah and 630Ah Smart Power Hubs run 300A.
The strategy that wins. Sleep under bedding, and run the heat pump as a get-up burst at dawn rather than all night — the same day-by-night plan our shoulder-season guide lays out. Heating is a heavier load than Eco cooling on the same bank, so "the AC ran all night in July" does not mean "the heat pump will run all night in October." The all-night runtime post owns the overnight cooling numbers.
Diesel heater runtime is a fuel question, not a battery one: at 0.10–0.40 L/h, a few gallons of diesel is many nights of heat. Its 24-hour timer is built for exactly the pattern above — off while you sleep under bedding, on 30 minutes before the alarm.
5. The fall recharge problem: shorter days and the 32°F cutoff
Two things go wrong with battery heating in fall that never showed up in summer: solar yield falls exactly when heating demand rises, and a cold-soaked LiFePO4 bank refuses to accept charge until it warms above freezing.
The summer solar formula our support team uses — panel watts × 0.8 × peak-sun-hours ÷ 12V, so 600W × 0.8 × 5 hours ≈ 200Ah on a good day — is a summer number. October brings fewer peak-sun hours and a lower sun angle, so don't carry that 200Ah into a heating budget. Size the bank for the night; treat the panels as the next-day refill, not the reason you can heat. (The complete solar sizing math lives in its own guide.)
The bigger fall surprise is the 32°F (0°C) charge cutoff: our batteries' BMS suspends charging below freezing to protect the cells. Discharge still works — the heat pump runs — but at dawn on a frosty morning your solar and DC-DC charger sit idle until the bank warms. Practical consequences: mount the battery inside the insulated envelope rather than in an unheated bay, expect a slower morning refill on freezing nights, and if you're driving, the alternator does the heavy lifting once things warm up — a 40–60A DC-DC charger is the verified range for this job, within each bank's charge ceiling (50A on the 230Ah, 75A on the 460Ah and 630Ah). On shore power, the recommended converter is 100A / 1,200W. The while-driving guide covers the DC-DC wiring; the watts-and-batteries guide covers the full recharge chain.
6. The propane-free stacks we actually recommend
Three builds cover nearly every propane-free customer we talk to — and the four-season one is a two-appliance answer, on purpose.
- The mild-weather weekender: Summit 2 12V ($895) for 10,000 BTU of cooling + 230Ah or 460Ah Smart LiFePO4 (from $585) + bedding rated for your nights. If a few cool mornings a year need more than a blanket, add the diesel heater and let its timer handle the get-up burst — it's cheaper than sizing a bank around electric heat you'll rarely use.
- The three-season boondocker: Glacier Pro 12V (11,500 BTU cooling, 8,500 BTU heat pump) + 460Ah or 630Ah Smart Power Hub — real heat above 36°F without fuel, and enough bank to run it for hours. Our Summit 2 vs. Glacier Pro chooser settles which rooftop unit belongs on your roof; check current availability on the product page before you plan around it.
- The four-season / full-timer: a 12V rooftop unit for cooling (Summit 2, or Glacier Pro if you also want fuel-free shoulder-season heat) + 5 kW split diesel heater ($349) as primary heat + 460Ah or 630Ah Smart Power Hub. This is the combination our support team calls the most stable real-world propane-free setup: the diesel heater does freezing nights on fuel, the rooftop unit does summer, and its fan mode circulates the diesel heat evenly through the cabin.
What all three share: LiFePO4 with a 100A-continuous (or better) BMS, 6 AWG within the 14 ft factory cord, the 100A inline fuse, and the low-voltage cutoff set to 11.0–11.5V for lithium.
7. Honest limits: what a propane-free plan can't do
Four boundaries we'd rather state than have you discover at 5 a.m.
- The 36°F line is physics, not a setting. Below it, the Glacier Pro is protecting its compressor, not heating your cabin. No rooftop unit is a winter furnace; the diesel heater is.
- The heat pump can't be added later. It's a factory configuration — a cooling-only Glacier Pro stays cooling-only. Buy the heat-pump variant on day one if your calendar has nights in the 40s.
- A propane furnace still wins one argument. For sustained sub-freezing heat in a large rig, a furnace rated in the tens of thousands of BTU is hard to beat. Diesel is the propane-free equivalent; battery is not.
- The diesel heater is a real install. Exhaust routing, a fuel pickup, and a mounting location — the kit is complete, but it's a job, not a plug-in. And on any rooftop unit: never run heating with the exterior covered — once a winter cover goes on, the unit is in storage. (Our winterization guide covers the shutdown procedure.)
FAQ
Can you heat an RV without propane?
Yes. Above about 36°F, a 12V reverse-cycle heat pump heats directly from the battery bank — the Glacier Pro delivers 8,500 BTU on 12V at a variable draw up to 55A, with no fuel or inverter. Below about 36°F, propane-free heating means a diesel heater, which makes its heat from fuel while the battery only runs the fan and pump. The rooftop heat pump does not replace a furnace in freezing weather.
How long will a battery run a 12V RV heat pump?
Plan on the 55A rated maximum: a 230Ah LiFePO4 bank is about 4 hours of ceiling-case arithmetic, a 460Ah about 8 hours, a 630Ah about 11 hours. Real draw is variable and runs lower once the cabin is holding temperature, so mild nights beat those figures; nights near the 36°F floor approach them. The bank's BMS must be rated 100A continuous — a standard 50A BMS trips.
Can a 12V heat pump heat an RV in winter?
Only above about 36°F (2°C). Below that, the Glacier Pro's controller throttles the compressor to roughly 20A to prevent liquid refrigerant from reaching it, and the outdoor coil runs defrost cycles that blow neutral air — a protection mode, not a fault. For camping at or consistently below 36°F, our support team recommends a dedicated diesel heater as the primary heat source and the rooftop unit for cooling and mild-weather heat.
Is a diesel heater better than a heat pump for an RV?
They do different jobs. The heat pump is the "take the chill off without burning fuel" tool — efficient, fuel-free, and limited to above ~36°F. The 5 kW diesel heater (rated to -40°F, 0.10–0.40 L/h) is the "it's freezing and I need heat all night" tool. Many of our customers run both: the rooftop unit for summer and shoulder season, the diesel heater for winter, with the AC's fan mode spreading the diesel heat through the cabin.
What size BMS do I need to run a 12V RV heat pump?
100A continuous, minimum. The Glacier Pro's heating draw of up to 55A — and its 62A Turbo cooling draw — will trip a standard 50A BMS regardless of the battery's amp-hour rating. OutEquipPro's 230Ah battery runs a 200A continuous BMS; the 460Ah and 630Ah Smart Power Hubs run 300A. Pair it with 6 AWG cable inside the 14 ft factory cord, the 100A inline fuse, and a low-voltage cutoff of 11.0–11.5V for lithium.
Related reading
- Shoulder-Season RV Camping: Cooling by Day, Heating by Night with One 12V Rooftop Unit (2026)
- Summit 2 vs. Glacier Pro: Which OutEquipPro 12V RV Air Conditioner Is Right For You? (2026)
- Can You Run a 12V RV AC All Night on Battery? Real Runtime Numbers (2026)
- How Many Watts (and Batteries) Does It Take to Run a 12V RV AC Off-Grid? 2026 Guide
- How Much Battery Do You Need to Run a 12V RV Air Conditioner All Day?
- Solar Panels for a 12V RV Air Conditioner: The Complete Sizing Guide (2026)
