The answer is "it depends on how effecient the compressor is" when aux heat strips are needed. My R22 compressor is good to about 35F but it wasn't desighned to be as effecient as they are today. Added to that it has lost some effecienc because of wear and tear. My R410a (Puron is a brand off 410) compressor does well at 15F which is about cold as it gets in Tx so I'm uncertain about anything lower. At the risk of going too far and over simplifying,here are a few facts about the subject that explains how the system works. Heat is present down to 0 Kelvin which converts to -459.67F. R22 sitting an open bucket can be carried like water at -40F. At -42F it will start to boil same as water does at 212F. It requires heat to boil anything so it is absorbing heat as it boils. Put R22 under 37psi and boiling doesnt happen until 37F. 76psi=45F boil. R410a boils at -61 at sea level,15F @ 70psi, 45F@130psi. Just for grins,R503 boils @-126F. To move heat from point A to point B,you need only minipulate the pressure on it and that's exactly what a compressor does. Raise the pressure and freon gives off heat,lower the pressure and it boils. During summer the compressor puts 300psi in the outdoor coil and freon heats the coil because it is giving up heat. When the same freon hits indoor coil at 60psi is boils by sucking heat from indoor coil. In winter,valves open/close to switch places with in and out coils. Round and round it go's. I hope that answers you question without boring you or cause insomna trying to make sense of it.
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