this post was submitted on 12 Jan 2024
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Senville claims that some models are good to -30C. Even their "cheap" stuff seems to be good to -15 or -20
Mine works down to -25 or -30C, then the electric heat coil in the furnace kicks in.
Wow - so you're saying not until around -25 to -30 does supplementary heat kick in? Is there cool air being blown out your vents 24/7 around that temperature?
Not at all... It's consistently warm, the system stops running the heat pump when it's not getting enough heat from the outside unit, and turns on the electric heater.
That would be the heat pump heats well enough until those temperatures
It works maybe, but it's definitely not efficient at those temperatures. Plus your unit won't last very long if you are driving it that hard. Lots of bold claims by these manufacturers, but let's check in, in a couple of years to see how that's going for the units.
My pool pump, the minute it hits about 6 degrees out, it starts icing and efficiency is out the window. I have to shut it down at night, because it often gets too cold in the evenings for it on the prairies, even in summer. When it hits about 10 degrees outside though, you fire that bastard on and it's warm in like 2 hours tops.
Less efficient, yes, but the system knows the temperature outside, and switches to electric heat automatically. Also, -40C is usually for short periods of time, and becoming more rare -- the advantages far outweigh the issues.
As for your pool -- it's likely not built to the same standard as your home heat pump -- and the icing sounds like a problem that might require some maintenance.
The pool heat pump is fine, it's a smaller unit so it's not like a house one that can go to low temperatures. We also live at 3,400 feet of altitude, the operating curve for heat pumps is different at any altitude vs what they are at sea level (which is what I believe the manufacturer quotes it at). When we bought it, that was one thing that was mentioned in the literature, that they aren't as efficient at higher altitudes and thus can't operate at as low of temperatures.
Good to hear. As soon as we can afford it, we'll be installing one.
The subsidy doesn't cover us because we're in a mobile home. If we get someone to pull the axles off, we'd qualify, but that's yet more money.
In the short term, it might make more sense to spend some money on insulation... My uncle lived in one in Northern Ontario, and even though it was skirted and sheltered by the forest around him, the fuel costs each winter were punishing.
Already done! :)
Theres a subsidy?
The federal government has one that is part of their Greener Homes Program. I believe there's also an Oil to Heat pump program.
We took a look at it for our place in Calgary when we installed our air conditioning, but the incentive was for around 5k. The provincial government doesn't offer anything here, so the A/C unit we looked at was about $4,500 done and dusted for a 2.5 ton name brand vs. about $12,500 for a heat pump. I'll tell you, if the subsidy would have covered another $1.5 to 2k, I would have taken a much much more serious look at it, just for even the AC aspect alone. Or if the province offered anything, but it's all oil and gas here, and the provincial government is much too busy lining their own pockets and the pockets of their supporters with single sourced procurements, but anyways
My FIL, who lives in Southern Ontario, put one in and loves it. He said it was a slam dunk decision with the subsidies, as there are both provincial and federal ones there I believe.
12.5k? Ouch. What size house?
1600sq ft. We need a cold climate pump, which is more expensive.
Keep in mind that while the heat pump works at low temperatures, it produces less heat. Senville’s 36000BTU unit produces just 27000 BTU at 17f per AHRI. The drop in output is an important consideration when evaluating system sizing and backup/auxiliary heating.
Thanks for the additional information! I'm still trying to get past all brochures and promotions to real data.
I have found NEEP’s tool extremely useful
Bookmarked! Thanks.