Hello all, Let me start with a gas furnace question. Correct me if mistaken, but with a gas furnace, say 100kBTU, if one is 80% efficient and the other 95%, you get more heating capacity with the 95%. So you might be able to use a slightly smaller furnace if 95% compared to 80%. Is that correct? Does the gas furnace efficiency also take into account any electrical savings related to a more efficient blower motor (because that part of it wouldn't change the size of furnace needed)?


Now to AC. Part of the efficiency improvement may be due to the compressor itself, part is due to the condenser coil, and part is due to the evaporator coil (and maybe a little due to fan motor ??). So if we compare an older 3-ton 10 SEER AC unit with a 3-ton 16 SEER AC unit for example, do we get more cooling with the 16 SEER unit, and thus does it impact the size of the AC unit needed?

I would think only the SEER improvement due to the evaporator coil is what might change the size of the AC unit needed, but that's what I'm asking. Is that something that contractors take into account when recommending an AC unit?

BTUs are BTUs. Same size.

BUT

High SEER units can be slow to reach full dehumidification potential due to large coil size and lower pressures. So it is more critical than ever NOT to oversize or move too much air.

now more to the point

Always compare the output BTU.

A 100,000 BTU input 80% efficient furnace, only outputs 80,000 BTUs.
A 80,000 BTU input 95% efficient furnace outputs 76,000 BTUs. Consumes an average of 20 cubic foot less gas, and gives you almost as much heat.


A 3 ton 10 SEER A/C has a nominal capacity of 36,000 BTUs, at a energy consumption of 1 watt per 10 BTUs output/capacity..
A 3 ton 16 SEER A/C has a nominal capacity of 36,000 BTUs, at a energy consumption of 1 watt per 16 BTUs output/capacity.

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