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Is 2 stage furnace worth it in dual fuel setup?

I have a similar system. I installed an 8 ton AC/Heat pump many years ago, with variable speed fans etc.I also added the electrostatic filters. I was was told that the only way to go was with electric ...
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Is 2 stage furnace worth it in dual fuel setup?

posting this as an answer bc of not enough space in comments. I'm not an HVAC expert, maybe others will contribute. But here goes: first, are you call it a "furnace", do you mean the gas ...
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29 votes
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Why would a particular heat pump model be illegal in my state?

I live in a high-altitude part of New Mexico, where I don't need to use much A/C, but need a more efficient heater for the winters. Then you're looking at the wrong figure. The number you're ...
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31 votes

Why would a particular heat pump model be illegal in my state?

While the SEER given on the label is in compliance with the regional standards for the Southwest, it must also meet an EER standard. Specifically, the regional standards are: Southwest (AZ, CA, NM, ...
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10 votes

Why would a particular heat pump model be illegal in my state?

The chart indicates that the heatpump could do much better. It's at 14.3 while the chart goes from 14 to 19. This suggests that there are more efficient heatpumps that you can acquire. Doing a random ...
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10 votes

Why would a particular heat pump model be illegal in my state?

I think this statement from a Carrier product page might hold the answer: This model may not be eligible for installation in the Southwest region of the country, based on Department of Energy minimum ...
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3 votes

Does a heat pump have separate unit for heating?

The normal setup The normal setup in a USA rust-belt, stick-built house is to have a central gas-powered Forced-Air Furnace usually in the basement. There is an enormous system of ducts all over the ...
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3 votes

Does a heat pump have separate unit for heating?

Split vs package systems Your current HVAC unit is called a package system -- it puts the entire refrigerant loop, compressor, and air handling system in one box, along with any auxiliary heaters that ...
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1 vote

Does a heat pump have separate unit for heating?

The first picture shows a combined Compressor and the heat exchanger in one. There are two fans inside. The compressor unit fan blowing up, and the second fan blowing on to the heat exchanger coil (...
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