DIY Mini-Split Heat Pump, Full Installation, 2021

Wow, this is the most efficient mini-split I’ve ever seen! I’ll show you the full installation. Every step is covered in detail. This is my first time installing this type of mini-split heat pump and it worked great.

I’m installing this in my garage, workshop, to cool it in the summer, and help heat it in winter. The installation went pretty smooth. The included manual shows you how to install most of the parts.

I installed this in the middle of summer, and it’s hot! After 48 hours of run-time the mini-split had the whole garage cooled to 64°F and is only drawing a tiny 130 Watts to maintain that temperature! Wow! That’s amazing how the inverter driven compressor can draw so little power.

The manual says to just pull a vacuum using a vacuum pump. However, I also include using a nitrogen tank to pressure test the system and check for leaks.

Since this mini-split can run on straight 240V (no neutral) I can run this on my Growatt inverters that I installed in a previous video. Actually, I could install up to 5 of these mini-split air conditioners on just one Growatt 5000 inverter. That’s a cool way to move some loads off the grid.

To purchase the 38 SEER heat pump go here:
This is an affiliate link. I’m sorry to say the discounts have expired.

Signature Solar provided this unit at no cost for the purpose of a review. However, the thoughts and opinions expressed in this video are mine and mine alone. Thanks for watching, David.

Amazon affiliate links:

Vacuum pump and gauge set:

Flare Tool eccentric cone:

Nylog sealant:

Lineset cover:

Deburring Tool:

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Growatt 5000W Inverter with 450V MPPT Charge Controller 5000ES:

Auto-Transformer, 5000ES:

EG4 Battery, 48V, 100Ah, 5.12kWh, LiFePO4, Server Rack design:

Waterproof EG4 battery: 48V LiFePO4 Lithium Battery with Bluetooth, EG4 Brand:

My videos are in no way intended to be instructional “how-to” lessons. I am simply documenting my project for informational purposes. Property damage, personal injury, or death may result, even when following manufacturer’s instructions. I cannot be held liable for such damage or injury. It is YOUR OBLIGATION to ensure that you are complying with any local and federal laws as well as code and permit requirements.

David Poz, LLC