31 Jul '12, 2pm

Roger Normand is building a Passivhaus, & explains why ductless minisplits make more sense than a radiant floor

The reason radiant floors don't make sense at PassiveHouse heat loads is that the temperature of the floor only needs to be a degree or two above room-ambient to deliver the design condition heat to the house, and most of the time it will be less than 1F above room temp. While a 71F floor in a 70F room is comfortable, it's hardly the cozy-warmth you're looking for. With radiant-baseboard (not fin-tube) or panel radiators you can run with warmer water temps and get at least a hint of the warm-glow effect, but it's still nothing like what you experience in code-min or older homes with radiators. Mini-splits always put out a warmer-than-body temp flow, and a minimum compressor & blower speeds have BTU/hour outputs more in line with the actual heat loads experienced in a PassiveHouse. They have very stable temperature control and you won't get signficant under/over shoot of th...

Full article: http://www.greenbuildingadvisor.com/blogs/dept/guest-blog...

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