Insulation & Air Quality
R-values, insulation targets by climate zone, and air purification that actually moves the needle.
Calculators
Guides
HEPA Filter Guide: True HEPA vs HEPA-Type, MERV and Furnace LimitsA true HEPA filter captures at least 99.97% of particles at 0.3 µm, the size that is hardest to catch; larger and smalle…Insulation R-Value Chart: Recommended R-Values by Climate ZoneAttics need about R-30 to R-49 in the warmest zones and R-49 to R-60 in most of the country. Wood-framed walls range fro…MERV Rating Chart: MERV 1–16 Efficiency by Particle Size and UseMERV (Minimum Efficiency Reporting Value) rates how well an HVAC filter captures particles in three size bands under ASH…What Is R-Value? Insulation Thermal Resistance ExplainedR-value is a material's resistance to conductive heat flow; the higher the number, the better it insulates. Layers in se…