Calculating design friction loss from available blower static pressure and total equivalent length — before the…

Massachusetts and Rhode Island code sets the indoor design conditions you size to — and the…

The occupied zone and radiant asymmetry, put in the terms you can actually use to set…

Five code requirements inspectors have rarely enforced and are now starting to fail permits over. Lead,…

Return duct sizing has improved in New England. The rule of duct design still being ignored,…

Massachusetts requires testing on new and altered duct systems statewide. What the code says, and what…

Ducts run tight against the roof deck: the CFM is not the problem, the delivered dry…

Attic insulation is hard to pin down on a quick sales call. The worksheet that turns…

HRV or ERV in a tight New England home: the freezing issue, the latent load, and…

Duct leakage gets tested; duct insulation gets a checkbox. The simple math for what poorly installed…