The BEST 12V Air Conditioner For Van Life? INSTALL & TEST

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Published 2022-08-17
I installed a UndermountAC 12V AC unit in our Transit van conversion and loved it. It can run for ~11 hrs on our Volthium 600AH 12V battery bank alone, and indefinitely with solar and alternator charging! In this video I walk you through the entire install, charging the system, and testing.

12V UndermountAC unit with ducted evaporator: undermountac.com/products/copy-of-complete-proair-…

Volthium 300AH 12V Lithium Phosphate Battery: volthium.com/en/

* This video was not sponsored. When preparing for my install I had a hard time finding any resources so I wanted to put together a video to help others. I was really happy with it and plan on installing this same unit on our new 2022 Transit van conversion.

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As always, please LIKE 👍🏻 this video, SUBSCRIBE to our channel, and COMMENT if you have any questions or feedback!

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Thank you for your support! 🙏🏻

Timestamps:
00:00 - 00:14 Intro
00:15- 1:39 AC Comparisons
1:40 - 4:25 Ducting Install
4:26 - 5:53 Things You'll Need
5:54 - 8:39 Mounting Condenser and Compressor
8:40 - 10:08 Drilling Holes for Hoses and Electrical
10:09 - 13:44 Prepping Evaporator and Fittings
13:45 - 19:41 AC Lines
19:42 - 31:47 Electrical
31:48 - 32:36 Drain Line
32:37 - 35:25 Prestite Tape and Thermostat Setup
35:26 - 43:34 Charging w/AC Coolant
43:35 - 47:53 Does it work?
47:54 - 48:23 Ou

All Comments (21)
  • Oh man, I wish I had this video a few months ago when I started installing mine! Another great video from you. Unfortunately I've had nothing but trouble with mine. From learning how to install it, evap not programed correctly, shops filling incorrectly, and now a frozen evap valve. Tom's been helpful though and is sending a new evap. Thanks for posting this...it makes all the difference to see someone do it seamlessly to understand how to do it. Great job!
  • Hi. as a a/c and refrigeration engineer in the transport world , you did a great job.
  • @warphillips
    Thanks for this, my system is on order, expecting to begin install in a couple weeks.
  • I’ve been studying this for two years. I’ve picked the same unit. It’s by far the best thing out there. Another drawback of the cruise n comfort is the hot compressor mounted inside the space your cooling.
  • @ososdechengdu
    I just completed a similar install of the UndermountAC system on a '21 Transit. Many thanks for putting this detailed video together, as it served as both reassurance during the purchase and a valuable resource during install. Some observations from my experience: - They are now shipping kits with some material differences including (1) a control board integrated into the Compressor (2) new (non ProAir) Condenser (3) new digital control pad. - The documentation is just some random notes. There is no proper installation manual and some information is old (see above), ensuring you will have to seek direct support. Fortunately, he is very responsive although I can't help but think it would be easier to just write everything down in a real product manual. - After seeing this video, I elected to install the Compressor in a slot towards the rear left. This allowed for easier install (esp. since removing the control board would be tricky), easier access for fill/maintenance, and no issue with the transmission. Despite going smoothly, it was definitely a challenging install and there were moments are regretted not just getting an unpowered integrated roof model. Now that it's done, I can't wait to unleash its power this summer. Going forward, I am a little concerned about support of the ProAir components since the company is defunct, but will cross that bridge later. Good luck to anyone embarking on the journey!
  • @Mark-gg6iy
    The underbody screws concern me. I would have strongly tried to use nylok nut/washer/ bolt to mechanically prevent dislodgement due to vibration. At the very least the screws you used should be positionally marked so future visual inspections can identify any possible movement easily. Great video and info, are being filed to aid in my design. A thermal curtain to trap the cool air where sleeping will be in my design. Tip: anytime you are having difficulty drilling use the reasonably smallest possible (4mm?) carbide bit simply as the pilot hole subsequently increasing in bit size.
  • At some point it would be great to insert a wifi-based thermostat into the control loop. We did this to our cruise-n-comfort because the analog control panel only uses a simple on/off switch and a fan speed dial making it easy to hack into with our ecobee. Great video, and great build. Hope to run into you guys some day.
  • Thanks for sharing and going through the whole process. lots of work! not sure if I want to go through that... how happy are you with your batteries and invertor.
  • Great video! This is what I have been seriously considering for my LC HJ45 build!
  • @Adam_Gray
    I'm thinking about installing this type/brand unit into my Sprinter 3500XD this fall. I would really appreciate your 1yr review of this particular unit and how well the undercount held up to driving conditions and how well the ducted cooling performed. Thanks for your time in both making this video and responding to viewer questions.
  • @FRZNTYM1
    Nice job on install. I have seen other mini - split systems where the condenser could not be mounted horizontal and needed at least a minimum 15 degree tilt. Nice you could mount yours this way and avoid road debris from damaging cooling fins.
  • @redbeardedt3437
    And this is why I did a mini split in my enclosed trailer conversion. Easy as possible installation, incredibly quiet at only 25 dB. It's 9,000BTU, and low power usage at 720W and 6.26amps. It's a 110v, so around 64amps on 12v, though I have a 24v system so it runs around 32amps. I have a 1000Ah 24v battery bank, so it can run around 30 hours on battery, with my 4000 watts of solar it'll pretty much run indefinitely, and it only cost me $750 for the mini split.
  • @Hozomean
    Nice job! Very informative. It would be interesting to know the decibel levels of your 3 options. Also, I suppose you'd have to be mindful of blocking that intake vent in the garage.
  • @yyl3683
    Great video! Very detailed and informative.
  • @odd13579
    Very nice install, thanks. If your van which already had air conditioning, a 12V electric compressor may be all you needed in order to provide AC when the engine's not running. They even make them with the automotive electrical interface! Then you don't need to duplicate the condenser and condenser fan already at the front of your van, or the interior evaporator and climate control fans.
  • @joelrugg
    Great video I have been thinking about this for my truck
  • @paulutd69
    Great install. With homes costing close to a median price of $300,000 to $600,000 nowadays there are Soo many young people and seniors doing van life. Hopefully more employers realize that the young demographic prefer remote work and the tech today does not preclude a workforce that has to be based in office towers. Thanks for posting this video!!! 12:13