How do I calculate how many tons of A/C I need to cool a house. I don't want the contractor to rip me off

Age of equipment, best you can tell... 10yrs Brand (Manufacturer)... nordyne.. intertherm Efficiency... see here Air conditioner... Package unit split system, (furnace inside A/C outside)... What does it do? Not do? It blows a little bit, but the air is like a vent not cool. W e...

You should have 5 wires running to the outside unit. 2 big heavy, insulated ones plus a ground from the breaker outside by the unit, and a couple of little insulated ones coming out from the furnace. With the thermostat calling for cooling, the big ones should have 240 V between them and the...

Hello all, Our residential building has to replace the air conditioner for the lobby and guess who's been asked to research it. The current A/C unit is attached to the ceiling in the basement and supplys air to the duct work leading to the lobby. A label on the unit indicates 2 tons. It's...