Contractor Talk - Professional Construction and Remodeling Forum banner
1 - 4 of 4 Posts

·
Registered
Joined
·
213 Posts
Discussion Starter · #1 · (Edited)
I'm curious about how efficiently my two systems are working together. We've had really low temperatures lately and most of the heating is being done by the heat pump. The oil does come on some but mostly the heat pump is just running a lot (like maybe 75% on & 25% of time off).

I'd like to know if it makes sense (energy cost wise) to run a heat pump at these temperatures or should I leave my system in emergency heat mode to run on oil all the time.

I know it depends on utility costs in my area but I thought the guys on here with a lot of experience would have a general idea of what's best.

Amazingly the heat pump is still heating the house it just runs a lot.

  • Honeywell 5000 - Model # th5220d1029
  • Heat pump (r22) & oil furnace combo (old/not high efficiency)
  • Temperatures have been between -4 & 10F
  • Inside temp set to 68 (always, no program)
 

·
Registered
Joined
·
2,515 Posts
Depends on what the oil cost, and what you pay for electric. But usually the heat pump is still more cost effective even at 0°F outside.
 

·
Registered
Joined
·
213 Posts
Discussion Starter · #3 ·
Depends on what the oil cost, and what you pay for electric. But usually the heat pump is still more cost effective even at 0°F outside.
Thanks for the reply...wow I didn't realize heat pumps still did well at low temps like that
 

·
Registered
Joined
·
2,515 Posts
In my area. people with natural gas as aux heat usually switch over to gas around 35 to 30 degrees. Gas is cheap. People with oil as aux will go as low as they can, and often that 25 to 20 degrees. Since the heat pump is sized to the cooling load, and we don't get as high of temps as your area probably does. Around 20 the heat pump can't heat the house to 70. So people are forced to use the expensive oil.
 
1 - 4 of 4 Posts
Top