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Pilsbury

air to air heating

Just had my visit from a company that phoned me up offering me a chance to save 80% on my gas bill using renewable air to air heating system I qualify for a grant on.
Turns out its an air source heat pump system and there is nothing renewables about it.
It will apparently save me80% on my heating and work as a air conditioning unit and air purifying unit.
The sales guy who turned up was surprised I had a clue what it was all about and pretty much knew he wasn't going to sell one so he actually gave me very little info but the quote for a unit on the outside of the house and 2 heating units inside supplied and fitted was 8100.....
We think it would save us at best 400 a year so not a,chance but it bugged me they are selling it as a renewable, the sales man actually admitted its not and doesn't know,why the cold caller are song that term.
Hairyloon

Maybe it is made of old fridges?
That's sort of renewable. Confused
john of wessex

wont work in Winter................
Hairyloon

wont work in Winter................

I think you are wrong. A friend of mine has it in their lobbin, and she is the type that won't put up with the cold.
vegplot

wont work in Winter................


They will up to a point but efficiency isn't good.
Hairyloon

wont work in Winter................

They will up to a point but efficiency isn't good.
Are you sure?
Rate of heat transfer is dependant on the temperature differential between the air and the machine.
Provided the machine can maintain a low enough temperature then there will still be heat transfer.
Cold air is denser, so it might even be more efficient.
Treacodactyl

Doesn't the system extract heat from the air going out of the building to heat the air coming in? vegplot

Doesn't the system extract heat from the air going out of the building to heat the air coming in?

If used in conjunction with a heat recovery system then efficiencies will be very much better.
vegplot

wont work in Winter................

They will up to a point but efficiency isn't good.
Are you sure?
Rate of heat transfer is dependant on the temperature differential between the air and the machine.
Provided the machine can maintain a low enough temperature then there will still be heat transfer.
Cold air is denser, so it might even be more efficient.
Quote:
Most air source heat pumps lose their efficiency as the external temperatures fall below 5 degrees Celsius (about 41 degrees Fahrenheit). In colder climates, the system needs to be installed with an auxiliary source of heat to supplement the heat pump in the event of extremely cold temperatures or when it is simply too cold for the heat pump to work at all.
boisdevie1

My mate installs heat pumps and they CAN be efficient if they are correctly installed and it's a good make of pump. But a lot of installers aren't that good so beware. Shan

wont work in Winter................

They will up to a point but efficiency isn't good.

I have one in my office and bearing in mind the temperature today, it works quite well.
vegplot

wont work in Winter................

They will up to a point but efficiency isn't good.

I have one in my office and bearing in mind the temperature today, it works quite well.

They work well enough but nowhere near as efficiently as GSHP.
Shan

True they are not as efficient but they are also not as expensive or disruptive. Pilsbury

True they are not as efficient but they are also not as expensive or disruptive.
Well as I said they quoted me 8100 to fit to my terrace house, one external unit and one heater in the ground floor and on on the landing, leave the doors open if you want warm rooms was the advice.......
Shan

I was lucky. I managed to get 2 units at cost price and my husband is qualified to fit them, so he did. Very Happy
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