Variable Speed Furnace Worth It. Just a plain 2 stage AC is very dumb this day and age. The higher the SEER the lower your utility bills.
A variable speed blower motor is 80 to 85 more efficient than a regular single-speed motor. The exact number of heating stages will vary depending on brand and model. I appreciate that there are small benefits to variable speed for heating loads but dont give a flip about.
2 Stage furnace has Heat Low usually 65 and Heat High 100 Modulating furnace has many stages and the real advantage here is that it can go as low as 30.
The key benefit of a variable speed air conditioner is its ability to ramp its speed up or down to meet the changing demand throughout the day and night. A two stage furnace lets the blower run under far less load making the variable speed blower that much more cost efficient. Variable speed furnaces have a payback period of approximately four to five years this means your new variable speed furnace pays for itself through generated energy savings in just a handful of years. Is a variable speed blower furnace worth it.