Saihemei 12V Under-Dash AC 13700 BTU
#1 in Under-dashFull review
The cheapest under-dash kit, with heating, but a 13,700 BTU claim and nothing else to check it against.
Amazon $358.99$358.99
The Saihemei 12V Under-Dash AC 13700 BTU rates 3.1 among under-dash parking air conditioners; the AClengda 24V 13000 BTU Split AC rates 2.9 among 24V split ones. The Saihemei 12V Under-Dash AC 13700 BTU costs $140.01 less ($358.99 vs $499).
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.
AClengda 24V 13000 BTU Split AC
#3 in 24V splitFull 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$499
Scores side by side
These two sit in different type classes (under-dash and 24V split), and each is scored against the reference points for its own class, so a rating says how well each does among its own type peers. How we rank explains each factor.
| Factor weight | Saihemei 12V Under-Dash AC 13700 BTU | AClengda 24V 13000 BTU Split AC |
|---|---|---|
| Overall rating | 3.1/5 | 2.9/5 |
| Value 35% | 69 $35.90 per 1,000 BTU ($358.99, 10,000 BTU credited of 13,700 claimed) | 40 $50.40 per 1,000 BTU ($499, 9,900 BTU credited of 13,000 claimed) |
| Efficiency 20% | 50 input power not published (neutral score used) | 100 14.4 BTU claimed per watt in (900 W), above what a battery-powered compressor delivers, so the claim is not credited further |
| Noise 15% | 80 45 dB listed for the indoor unit | 50 noise rating not published (neutral score used) |
| Features 20% | 0 none listed | 0 none listed |
| Warranty 10% | 0 warranty not published, scored as none | 0 warranty not published, scored as none |
Specifications
| Saihemei 12V Under-Dash AC 13700 BTU | AClengda 24V 13000 BTU Split AC | |
|---|---|---|
| Cooling and power | ||
| Claimed cooling | 13,700 BTU | 13,000 BTU |
| Supply voltage | 12 V | 24 V |
| Input power | - | 900 W |
| Starting current | - | 45 A |
| Heating | Yes | - |
| Build | ||
| Layout | Under-dash, one unit | Split, two units |
| Ships charged with refrigerant | - | No |
| Controls, noise and warranty | ||
| Indoor noise | 45 dB | - |