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Question DetailsAsked on 3/2/2016

Do you need to wait for warmer temps to have your freeon tested in hvac system?

I was informed that I would have to wait until outside temp reaches 70 or above to have an accurate test on hvac system(tune up) to be conducted, however, most companies in my area are already scheduling appointments for march and april where temps will most likely not reach 70 or above

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2 Answers


Different manufacturers say different temperatures - I have seen from 50 to 70F on manufacturer info - 70 and 65 are numbers a lot of HVAC people use.

There are several types of damage that can occur if you run it colder than that, depending on system design and type of compressor and on whether the condensor fan run whenever the system is running or only when needed for cooling the compressed refrigerant:

1) slugging of the refrigerant resulting in high pressure building in the low pressure side of the system, or overpressuring of the evaporator which can burst it

2) foaming of the refrigerant and oil in the compressor which can damage it as it reduces lubrication

3) oil being too cold to migrate with the refrigerant so it accumulates in the lines instead of in the compressor sump, resulting in poor lubrication and compressor damage

4) ice blockages in the system (especially the dryer and expansion valves) causing overpressurization

5) liquid refrigerant on the low pressure side, resulting in incorrect operation of the in-line control valves and incorrect running pressures

None of these are good - so unfortunately you have little choice. If buying a house, I have heard of significant funds (up to the replacement cost of the A/C system) being held in escrow after closing pending a successful A/C test when the weather get warm enough. In my area (very short A/C season, most A/C's being commercial, in businesses which generate a lot of heat like restaurants, or medical or computer facilities) I have seen heated tenting of the outdoor A/C components to work on it or test it, for an additional $150 or so charge.

Answered 4 years ago by LCD


Not necessary if the technician is competent and the contractor is professional; however; I would wait for warmer weather. Right now in So. Calif. we are having nice afternoon weather in the low 70's, which is ideal for HVAC tune-ups.

Source: Poppy Ross

Answered 4 years ago by PoppyRoss

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