Radiant to make downstairs warmer?
We live in a mild climate in SF Bay area in a cool/foggy zone.
House is late 60s build and we’ve replaced the single pane windows but the original insulation, 2×4 construction and high ceilings make for a pretty inefficient home.
Heat is currently supplied with a mr cool universal heat pump (5ton) it works well for our needs but not surprisingly there is a meaningful temperature imbalance. It will be 67 downstairs in the family room but 73 in the upstairs bedrooms. (There is no way to close off one floor from another)
House is 3100 sq feet and we are planning on adding another 5-600 feet downstairs. (1000-1200 total downstairs)
One option we could do is to add radiant downstairs (staple up w/ plates in existing area and slab for the addition). We already have a navien NPE 240 and could add radiant relatively affordably. My concern is – if we turn down the forced air to bedrooms to say 65 at night, would the radiant essentially run all night as all the heat would escape upstairs? Would i be better off just creating a separate forced air zone for downstairs?
GBA Detail Library
A collection of one thousand construction details organized by climate and house part