KNOLET 12V 13500 BTU Split AC
#1 in 12V splitFull review
The largest 12 V claim here at a low price, on a 20 cc compressor, which is the reason to doubt 13,500 BTU.
Amazon $372.92$372.92
A parking air conditioner runs from the vehicle’s batteries so a driver can sleep in a cab or work in a van with the engine off. Most are two-piece “mini split” units: a compressor and condenser box mounted outside behind the cab, and a small evaporator inside, joined by refrigerant lines. Under-dash kits put everything in one housing under the dash or seat. Sellers on Amazon offer dozens of them at $250 to $700, and many are the same factory design sold under different names.
Voltage comes first. A 12 V unit pulls roughly 60 to 80 A, which needs heavy cable and a large battery bank; a 24 V unit draws about half that current. Match the unit to the truck’s electrical system, not to the battery you plan to add. Each voltage is ranked on its own, and under-dash kits have their own list.
BTU claims need a second look. Many listings state 10,000 to 13,500 BTU while giving an input power of 750 to 960 W. A battery-powered compressor does not produce that much cooling per watt, and several listings give a cooling figure in watts that works out to fewer BTU than the headline number. These rankings credit claimed cooling only up to 11 BTU per watt of input, so an inflated claim does not win on value.
Most listings leave out the basics. Few publish a warranty, and most do not ship with refrigerant, so a buyer has to add R134a and usually pay a shop to charge the system. Where a figure isn’t published here it is marked, not guessed.
Prices were last checked November 4, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
Top Picks
COOLIGO 12V 12000 BTU Split AC
#2 in 12V splitFull review
One of the cheapest 12,000 BTU units, with a low-voltage cutoff and almost no specs behind the claim.
Amazon $317.28$317.28
AClengda 12V 9000 BTU Split AC
#4 in 12V splitFull review
A modest 9,000 BTU claim on 850 W and a quiet 40 dB indoor unit, so its numbers are the easiest here to believe.
Amazon $499$499
Shop by Type
12V split
12 rankedTwo-piece units for 12 V trucks, vans, buses and tractors: an evaporator inside, a compressor and condenser outside.
Top rated: KNOLET 12V 13500 BTU Split AC $372.92
24V split
3 rankedThe same two-piece design for 24 V semi trucks, buses and construction equipment, drawing half the current of a 12 V unit.
Top rated: UAHKPA 24V 13000 BTU Split AC $439
Under-dash
4 rankedSingle-housing kits that mount under the dash or a seat, many with a heater, in 12 V and 24 V.
Top rated: Saihemei 12V Under-Dash AC 13700 BTU $358.99
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Best 12V Split Parking Air Conditioners
- KNOLET 12V 13500 BTU Split AC#1 of 12Full review
The largest 12 V claim here at a low price, on a 20 cc compressor, which is the reason to doubt 13,500 BTU.
Amazon $372.92$372.9213,500 BTU-46 dB - COOLIGO 12V 12000 BTU Split AC#2 of 12Full review
One of the cheapest 12,000 BTU units, with a low-voltage cutoff and almost no specs behind the claim.
Amazon $317.28$317.2812,000 BTU-- - UAHKPA 12V 9000 BTU Split AC#3 of 12Full review
The listing publishes power, starting current and airflow, which few clones do, and the numbers hang together.
Amazon $399$3999,000 BTU800 W- - AClengda 12V 9000 BTU Split AC#4 of 12Full review
A modest 9,000 BTU claim on 850 W and a quiet 40 dB indoor unit, so its numbers are the easiest here to believe.
Amazon $499$4999,000 BTU850 W40 dB - Aspligo 12V 12000 BTU Split AC#5 of 12Full review
A 12,000 BTU claim on 800 W of input, so the capacity is credited only down to what the power can deliver.
Amazon $519.99$519.9912,000 BTU800 W-
Best 24V Split Parking Air Conditioners
- UAHKPA 24V 13000 BTU Split AC#1 of 3Full review
The same 24 V kit as AClengda’s with a remote and a published airflow, at a lower price.
Amazon $439$43913,000 BTU900 W- - Treeligo 24V 12000 BTU Split AC#2 of 3Full review
A quiet 24 V unit with a 350 CFM airflow claim, but no power figure.
Amazon $479.99$479.9912,000 BTU-45 dB - AClengda 24V 13000 BTU Split AC#3 of 3Full review
A 24 V unit for a semi or bus: 13,000 BTU on 900 W is a stretch, but 45 A to start is easy on a 24 V system.
Amazon $499$49913,000 BTU900 W-
Best Under-Dash Parking Air Conditioners
- Saihemei 12V Under-Dash AC 13700 BTU#1 of 4Full review
The cheapest under-dash kit, with heating, but a 13,700 BTU claim and nothing else to check it against.
Amazon $358.99$358.9913,700 BTU-45 dB - Treeligo 12V Under-Dash AC 12000 BTU#2 of 4Full review
A quiet under-dash cooling kit at a lower price than Aspligo’s, with no input power given.
Amazon $433.19$433.1912,000 BTU-45 dB - Aspligo 12V Under-Dash AC and Heater#3 of 4Full review
An under-dash kit that also heats from engine coolant; its 575 W rating fits a 10,000 BTU claim better than most.
Amazon $459.99$459.9910,000 BTU575 W- - Aspligo 24V Under-Dash AC 10000 BTU#4 of 4Full review
The only 24 V under-dash kit here that is cooling-only and cheaper than the heater versions.
Amazon $529.99$529.9910,000 BTU--
How We Rank
Each unit is ranked against others of the same type and voltage, and scored on its price per credited BTU, its claimed BTU per watt, its noise, its features and its warranty.
| Factor | Measures | Weight |
|---|---|---|
| Value | price per 1,000 BTU of credited cooling | 35% |
| Efficiency | claimed BTU per watt of input | 20% |
| Noise | listed sound level of the indoor unit | 15% |
| Features | inverter, remote, ships charged, low-voltage cutoff | 20% |
| Warranty | warranty on the unit | 10% |
How we rank explains each factor in full.