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Continue with the same size piping that comes out of the condenser and take it up to the evaporator.

For an 8 hour absence I would turn it down, not off. There is no such thing as free energy. Depending on how much the unit will need to recover if turned off will determine the cost.

Dryers are normally placed on the high side (liquid) and should be good for the life of the AC unit. If the unit is ever exposed to the atmoshere then it would need to be replace. Use only one dryer....

I would see if the leak can be fixed. If the aluminum coils are leaking due to corrosion then I would suggest a new coil assembly, not a repair. All other leaks should be able to be repaired. The...

Are you replacing this transformer with one exactly like the original? Is it a 120/24 or 220/24. Check the booklet that came with the thermostat and make sure you are replacing the transformer with...

This is an 18 year old Lennox 5 ton 2 speed central AC unit. Over the years it has not been used much as I am not an AC guy. The unit is in good shape. I know a little about basic AC so that makes...