i own a house built in the 1920s and still using what i think is the same oil-powered furnace for at least the last 60 years. time for an upgrade. everything i am reading suggests that geothermal in a house without ductwork or any modern systems is the way to go due to the various rebates available that would offset the cost of the full install. we also plan on removing the siding, insulating, and replacing windows. a few questions:
- in the northeast, i believe a backup system is typically needed in case underground temperatures get too low for the heat pump to operate. is this right? is the typical backup system a boiler (hydroair)? are the "backup" systems typically big enough to heat the whole house?
- in terms of general comfort, what temperature range can you keep a house that has a geothermal heating system? for example, if (i mean when) my wife gets cold, can i increase the temp by 2-3 degrees easily? i know that geothermal systems are slow to respond but will the backup system kick in to do it immediately?
any other advice?