Heating alternative for a Passive House
I’m in the early stages of planning my own passive house (PHI) in climate zone 6 near Minneapolis. Current design is about 1,550 SF, so that sets the budget of 4,960 btu peak heat demand…long road ahead! I’m exploring alternatives to minisplit or baseboards for primary heating with good zoning and distribution.
Here’s the hair-brained idea: radiant heat cable run through base trim and underneath the deep window sill finish, call it stone or tile. Kerf cut some vertical trim boards to cover the loop up to the corners of sills keeping everything inboard of drywall for eventual service or replacement. Cables get about 10.4 btu per lf and come in plenty of lengths. This should make it easy to right-size for the peak load in each space/zone and targets the sill which tends to be the lowest surface temp. Invisible, great window CR, temp equalization and hopefully comfort with lower set points. Obvious con is atypical installation, COP of 1 and higher cost than baseboards. But I’m fairly confident I could design and install this myself. Not much to it.
Thoughts or other cons I’m missing? Would this be better suited as a backup for a minisplit all things considered?
Thanks in advance for responses.
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