AC Sizing

At 400 CFM per ton, 2,000 CFM corresponds to about 5 nominal tons; at 350 CFM per ton it corresponds to about 5.7 nominal tons.

Manual J inputs should be checked before replacement so the new AC is selected for the house as it exists now.

A common residential target is about 350 to 450 CFM per ton, with 400 CFM per ton used as a frequent starting point rather than a law.

Cooling load is what the house needs removed; cooling capacity is what the equipment can remove under rated conditions.

If you keep asking why is my AC blowing air but the house still feels warm, the key thing to understand is this: moving air is not the same thing as delivering enough cooling. A central AC system can absolutely keep blowing from the vents while the house still feels warmer than it should. That…

If you are asking can I reuse old AC line sets with a new unit, the honest answer is sometimes, but not automatically. This is one of those HVAC replacement questions that sounds small, but it can have a big effect on how well the new system performs. Homeowners often focus on the outdoor condenser,…

If you are asking do I need a new thermostat with a new AC, the honest answer is not always, but sometimes yes. A lot of homeowners assume the thermostat is a small accessory that can always stay in place when the air conditioner gets replaced. Sometimes that is true. But sometimes the thermostat becomes…

If you are asking can you replace an AC without replacing the furnace, the honest answer is yes, sometimes. But whether you should do it is a different question. A lot of homeowners run into this when the air conditioner fails first but the furnace still seems to be working. On the surface, it feels…

If you are asking can you replace just the outdoor AC unit, the honest answer is: sometimes, but usually not as cleanly as homeowners hope. On the surface, it sounds simple. The outside condenser is the part that failed, so why not replace only that piece and keep the rest of the system? The problem…

If you keep asking why does my house feel humid at 72 degrees, the problem is usually not the thermostat number itself. A house can absolutely be 72°F and still feel clammy, sticky, heavy, or uncomfortable if the indoor humidity is too high. That is why temperature and comfort are not always the same thing….