Warm Air Heating Systems - Do you have any experience with them?

danrv

Reed_Richards said:

I can't help thinking that ducts to carry warm air combined with an air to air heat pump should be really efficient and really green.  But I guess if it happens it will be in North America before here.  

That’s exactly what I was hoping to do. 
My property has uninsulated galvanised steel ducting in the walls that I thought about using for a new heating system.
Main problem would be heat loss as ducted aircon systems use flexible insulated ducting. 
Maybe could use that inside the steel stuff but that’s when I lost interest in the retrofit.
Electric warm air is history. 

Modern storage space heaters seem the logical and easier replacement. 

Reed_Richards

coffeehound said:

Air-to-air heatpumps have been used with ducted MHRV systems for many years in Scandinavia for pre-warming or -cooling the air from the heat exchanger

Then might not the energy input that is sufficient for pre-warming in Scandanavia be sufficient to do all the warming in our milder winters?

Reed_Richards

danrv said:
...

My property has uninsulated galvanised steel ducting in the walls that I thought about using for a new heating system.
Main problem would be heat loss ... 

Modern storage space heaters seem the logical and easier replacement. 

Any heat lost in interior walls should ultimately find its way out into the room; the walls will act like underfloor heating.  The advantage of the air-to-air heat pump is that it should have about 1/4 of the running cost of any other form of direct electrical heating.

danrv

Reed_Richards said:

danrv said:
...

My property has uninsulated galvanised steel ducting in the walls that I thought about using for a new heating system.
Main problem would be heat loss ... 

Modern storage space heaters seem the logical and easier replacement. 

Any heat lost in interior walls should ultimately find its way out into the room; the walls will act like underfloor heating.  The advantage of the air-to-air heat pump is that it should have about 1/4 of the running cost of any other form of direct electrical heating.

Thanks.
Actually most of the ducting (2m) is in the warm air heater cupboard. It does get very warm in there but that’s not where I want the heat.
An indoor aircon unit could easily fit in there which would then connect to the outdoor one.
An adapter would be needed to fit the 4x8 inch ducting to the unit.

Could work but probably an expensive install and not as maintenance free as storage heaters.