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Low temperature staple up radiant heating
I’m evaluating a possible staple up radiant heating job.
The house burns a lot of propane and the owner wants to stop spending as much as his mortgage on heating the house in winter. Insulation and air sealing land are in the works but beyond making the house more efficient, I’d like to make it less dependent on such an expensive fuel Source.
Air to air heat pumps have been explored and they will probably be what I go with on this job but I’m curious about another.
An air to water heat pump.
Expensive but really cool.
The model i was after puts out 120degf water until 14degf then it derates until minus 5 when it shuts off.
My average low temperature in my coldest month last year and before was around 17 but we frequently get days and sometiese a week we’re we are below 14f. At that point I could still use the heat pump and it would be vastly more economical than propane. I could supplement it with electric auxiliary heat but that is only slightly cheaper per btu.
My question is: can I run a lower water loop temperature (say 105 degf) if I run more tubing closer together in the floor joists?
Pex can theoretically be bent to a radius of 6 times it’s diameter so I could theoretically install 6” on center and fit 3 runs into a typical joist bay.
Has anyone ever tried running loqer than 120degf temps in radiant staple up jobs?
Does the closer spacing even translate to lower temps?
There’s a shag carpet in the loving room which will be eventually replaced with hardwood. Linoleum in the kitchen which will eventually be replaced with tile or hardwood and then typical carpet in the bedroom.