Air-to-Air Heat Exchangers for Healthier Energy-Efficient Homes

Re:Air-to-Air Heat Exchangers for Healthier Energy-Efficient... by oliwarner on Saturday February 04, 2023 @09:16AM (#34654638)

100mm? Not sure what your climate is but the recommendation in the UK has been 270mm for two decades (based on 0.044W/m²K fluff). It's a relatively cheap and easy upgrade.

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Re:Air-to-Air Heat Exchangers for Healthier Energy-Efficient... by Freak_NL on Saturday February 04, 2023 @10:43AM (#34655268)

In an old house? Rarely. I've been able to fit 100mm of PIR (Polyisocyanurate) under my roof (1920s Dutch terraced brick house), and that is pushing it without eating too much into your living space.

PIR is a great solution for space-constrained insulation though: 0.022W/m²K, so 100mm gives you a thermal resistance of 4.54m²K/W. It's the equivalent of 200mm of mineral wool with a thermal insulance of 0.044W/m²K.

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Re:Air-to-Air Heat Exchangers for Healthier Energy-Efficient... by lnsru on Saturday February 04, 2023 @01:04PM (#34656520)

270 mm for roof or walls? For roof yes, for walls I don’t know. I have no plan to create passive home from an old one.

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