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Question DetailsAsked on 8/21/2015

Will home hvac system come on with no freon in the system?

I'm worried that if my HVAC unit is low on freon and I try to run it, I will destroy the compressor.

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1 Answer


Right you are - if drained out you will fry your compressor, because the lubricating oil moves with in the refrigerant gas in almost all residential compressors these days, so no gas, little or no lubrication. Even if yours has an automatic overtemp shutoff, by the time it goes off the compressor may well be toast. A few brands have pressure switches that automaticlaly cut the power if the pressure goes to high or drops too low, but a great many do not (but should).

If not cooling well or you think it has bled out, shut off the breaker for the A/C unit. Almost always on its own circuit so only that item will be shut off, and almost always (except for window or floor units that come with a wall-outlet type plug on them) is a double breaker - two breakers tied together with a tiebar so they trip together. Experiment if necessary with the breakers if not labelled - double breakers usually serve the following appliances - electric dryer, electric stove/range, electric water heater (including whole-house tankless), electric furnace, and some very deep or very high capacity well pumps, so those are the items to check if you have to start turning on double breakers to figure out which is controlled by which breakers.

Another less secure way to keep it from coming on - if your thermostat(s) has/have a Heat and A/C, or maybe Heat/AC/Fan settings switch, turn it to Heat so the A/C does not see a call for cooling. Furnace will not turn on unless the inside temp drops below the thermostat setting.

Of course, Heating and A/C is your Search the List category for A/C servicing.

Answered 4 years ago by LCD

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