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Forum: Geothermal & Heat Pumps

02-27-12, 09:10 AM

Replies: 11

Running cost: ASHP vs. Nat Gas Furnace

Views: 12,925

Posted By abogart

I just plugged the numbers from a Water Furnace...

I just plugged the numbers from a Water Furnace geothermal heat pump in to the mix. Factoring in open loop with a shallow well pump and 50°F entering water temp, the numbers are disappointing....

Forum: Geothermal & Heat Pumps

02-13-12, 05:32 PM

Replies: 11

Running cost: ASHP vs. Nat Gas Furnace

Views: 12,925

Posted By abogart

I think the trick is to tune to system and...

I think the trick is to tune to system and changeover temp to always use the cheaper source of heat. That is one advantage of a dual-fuel system. As mentioned before, at my gas and electric rates the...

Forum: Geothermal & Heat Pumps

02-13-12, 12:07 PM

Replies: 11

Running cost: ASHP vs. Nat Gas Furnace

Views: 12,925

Posted By abogart

I have also been thinking about building a little...

I have also been thinking about building a little "house" for the outdoor unit with vented walls set out about a foot or so from the unit and a riser vent in the top to route the discharge air...

Forum: Geothermal & Heat Pumps

02-13-12, 11:42 AM

Replies: 11

Running cost: ASHP vs. Nat Gas Furnace

Views: 12,925

Posted By abogart

Here is another spreadsheet, this time comparing...

Here is another spreadsheet, this time comparing the Goodman 4 ton and a 96% AFUE gas furnace to my existing 80% gas furnace. It's quite clear this time that this unit would be cheaper to run than...

Forum: Geothermal & Heat Pumps

02-13-12, 09:34 AM

Replies: 11

Running cost: ASHP vs. Nat Gas Furnace

Views: 12,925

Posted By abogart

I might have messed up the numbers in the HP...

I might have messed up the numbers in the HP calculations. Since the specs on the given HP didn't include electricity usage at each temp, I divided the kW heat output at each outdoor temp by the COP...

Forum: Geothermal & Heat Pumps

02-12-12, 09:34 PM

Replies: 11

Running cost: ASHP vs. Nat Gas Furnace

Views: 12,925

Posted By abogart

Running cost: ASHP vs. Nat Gas Furnace

I have been crunching some numbers lately, considering if it would be worth the investment to replace my outdated, undersized central AC unit with an ASHP. The idea is to use the ASHP to provide...

Showing results 1 to 6 of 6

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