lumenlab.com Recharging my 3 year old heat pump with propane, otherwise known as R290 and somewhat falsely marketed as R22a or ES22..."environmentally safe". It is not very dangerous and already used in millions of autos and houses. The system is closed, and the propane has an odorant (ethyl mercaptan) so you can detect any serious leaks and vent the system (legally even). R22 is a very nasty CFC that is being phased out. My system took 6lbs of propane and blows 55f at the farthest register.
Tags: HVAC, heat pump, propane, R22a, es22a, Brainchilds, Lab
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