Original data and independent reporting for the HVAC trade
Analysis & data
Newest first-
Attic Ventilation: How Much Your Roof Actually Needs
The 1/300 and 1/150 ratios, what net free ventilating area means, a worked calculation, and why exhaust without intake pulls conditioned air out of the house.
Industry news
From the trade-
America Had 132.5 Million Homes in 2024
EIA’s 2024 residential survey counts 132.54 million homes, up from 123.53 million. What it says about climate regions and housing age, and what is missing until 2027.
- Still allowed
R-410A equipment built before 2025 can still be installed
EPA’s final rule removed the installation cutoff for inventory manufactured or imported before January 1, 2025. New R-410A equipment cannot be built or imported. Several states are stricter. Full rule detail
- Expired
The federal 25C heat pump tax credit is gone
The credit, worth up to $2,000, applied to property placed in service before December 31, 2025. Installation date controls, not purchase date. State and utility rebates are unaffected. What this costs you
- Still rising
Equipment prices set another high in August
Producer prices for HVAC equipment are up 60% since 2019 against 31% for consumer prices. August 2026 is the highest reading in the series. See the index