Cornerstone A/C & Heating

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Tune-Up

Maintenance

Our Cooling Tune-Up
for systems needing a boost in efficiency
Ask about our No Breakdown GUARANTEE*

This service is recomended for Spring & Summer
( March through November)

1 ) Check  head pressure.
2 ) Check suction pressure.
3 ) Record head freon temperature.
4 ) Record suction freon temperature.
5 ) Record indoor air temperature.
6 ) Record supply air temperature.
7 ) Calculate subcooling and superheat.
8 ) Record amp draw on compressor.
9 ) Record amp draw on the outdoor fan motor.
10 ) Inspect points on contactor.
11 ) Inspect condenser coil for blockage.
12 ) Inspect high voltage connection to condenser.
13 ) Inspect low voltage connection to condenser.
14 ) Check air filter.
15 ) Check thermostat calibration.
16 ) Inspect evaporator coil for blockage (if accessible.)
17 ) Inspect condensation overflow drain pan.
18 ) Inspect condensation drain line.
19 ) Check air flow to all supply air registers.
20 ) Inspect return air duct.
21 ) Calculate temperature change across evaporator coil.
22 ) Clean condenser coil.
23 ) Clean evaporator coil. (If accessible.)
24 ) Clean primary condensate line.
25 ) Seal air leaks on plenum, transition, evaporator coil and furnace.
26 ) Adjust system charge with up to 1 lb. of Freon R410A if needed.

This is a comprehensive tune-up and is guaranteed to lower your cooling cost.
*Non-working systems will require a diagnostic fee to determine fault.








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