Heating systems for new home

Biggd · 02-04-2023, 09:00 AM

Quote:

Originally Posted by ishoot308

As promised here ya go….12 below zero and still keeping up just fine. Approximately 1200 square foot apartment over garage. Mitsubishi hyper heat single zone mini split heat pump, (don’t remember the size). Impressive!

Dan

That's impressive! My house is about 1700 sq ft, lots of windows. With the sun shining in yesterday and the wood stove going full bore it got up to 76. Last night it dropped to 65 with the wood stove going full blast. I set the heat t-stat at 65 in case I didn't wake up to reload the stove.

I've been thinking of adding mini splits for AC and those days, in the high 40's & 50's, when it's not quite cold enough to light the stove.

ishoot308 · 02-04-2023, 09:29 AM

Quote:

Originally Posted by Biggd

That's impressive! My house is about 1700 sq ft, lots of windows. With the sun shining in yesterday and the wood stove going full bore it got up to 76. Last night it dropped to 65 with the wood stove going full blast. I set the heat t-stat at 65 in case I didn't wake up to reload the stove.

I've been thinking of adding mini splits for AC and those days, in the high 40's & 50's, when it's not quite cold enough to light the stove.

I will say that this living space above my garage is only a few years old and is very well insulated and I think that is obviously key.

I have mini splits out at my island camp also but not the hyper heat units just standard ones since I only use them for AC but they also kick butt in cooling down the camp on the hottest of days.

Dan

joec · 02-04-2023, 10:53 AM

I stayed up and monitored my Mitsubishi hyper heat heat pumps until 2AM last night and they performed well above my expectations. The specs on the heat pumps say the minimum temperature to make heat is -13. At 1:30AM, it was -17. The thermostat was set at 73 and maintained at 72 most of the day and dropped to 71, then 70 at 1:30 and stayed there. The house was 70 at 7AM this morning when it was -16.

The heat pump was a one to one 18,000 BTU unit that heated the entire downstairs, stairwell hall, upstairs hall and bath, about 850 square feet.

I have a second 3 head unit for each bedroom and heated only one bedroom last night with that and it did the job.

I have a propane stove in the living room as back up ready to go but it wasn't needed.

I had the dogs out at 1AM and those outside units were really working hard. The efficiency of the heat pumps were probably poor compared to oil or natural gas. The only other thing I noticed was the defrost cycles took a lot longer and it took longer for the heat to ramp back up. That was a little scary when the temperature got down below -14, but the heat pumps passed the test.

DougNH · 02-04-2023, 11:55 AM

Meredith about -17, Mitsubishi hyper heat, 5 heads, 42kBTU (2 years old). Monitored on the kumo cloud app from MA. This is for my 2nd floor, heads in 4 bedrooms and a large 40x20x10 room. Probably not a good comparison as the bedrooms open to a loft/great room and receives heat from the 1st floor which is oil boiler, hydro heat. I usually leave the 1st floor at 58 and 2nd floor at 60 but the heads in the bedrooms do not run much.

The large room (no heat from 1st floor) held 60 all night. As much as I like the system, I would have a backup plan. For us we have a propane wood stove in the large room.

02-04-2023, 10:53 AM	#3
joec Junior Member Join Date: Jul 2015 Posts: 13 Thanks: 0 Thanked 9 Times in 5 Posts	I stayed up and monitored my Mitsubishi hyper heat heat pumps until 2AM last night and they performed well above my expectations. The specs on the heat pumps say the minimum temperature to make heat is -13. At 1:30AM, it was -17. The thermostat was set at 73 and maintained at 72 most of the day and dropped to 71, then 70 at 1:30 and stayed there. The house was 70 at 7AM this morning when it was -16. The heat pump was a one to one 18,000 BTU unit that heated the entire downstairs, stairwell hall, upstairs hall and bath, about 850 square feet. I have a second 3 head unit for each bedroom and heated only one bedroom last night with that and it did the job. I have a propane stove in the living room as back up ready to go but it wasn't needed. I had the dogs out at 1AM and those outside units were really working hard. The efficiency of the heat pumps were probably poor compared to oil or natural gas. The only other thing I noticed was the defrost cycles took a lot longer and it took longer for the heat to ramp back up. That was a little scary when the temperature got down below -14, but the heat pumps passed the test.

The Following 3 Users Say Thank You to joec For This Useful Post:
Biggd (02-04-2023), ishoot308 (02-04-2023), Slickcraft (02-04-2023)

02-04-2023, 11:55 AM	#4
DougNH Senior Member Join Date: Aug 2006 Location: Meredith Bay/MA Posts: 79 Thanks: 119 Thanked 49 Times in 19 Posts	Meredith about -17, Mitsubishi hyper heat, 5 heads, 42kBTU (2 years old). Monitored on the kumo cloud app from MA. This is for my 2nd floor, heads in 4 bedrooms and a large 40x20x10 room. Probably not a good comparison as the bedrooms open to a loft/great room and receives heat from the 1st floor which is oil boiler, hydro heat. I usually leave the 1st floor at 58 and 2nd floor at 60 but the heads in the bedrooms do not run much. The large room (no heat from 1st floor) held 60 all night. As much as I like the system, I would have a backup plan. For us we have a propane wood stove in the large room.