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1.
▲
Homemade Heat Pump Manifesto (2009)
(ecorenovator.org)
481 points
walterbell
4 years ago
247 comments
2.
▲
DIY ventilation heat exchanger (2010)
(ecorenovator.org)
142 points
walterbell
2 years ago
99 comments
3.
▲
DIY Heat Recovery Ventilation
(ecorenovator.org)
2 points
iforgottherest
5 years ago
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