HVAC Labor Rate: How to Set Your Hourly Rate
How HVAC contractors set a billable labor rate that actually makes money — the loaded-rate formula, labor burden, overhead, billable-hour reality, flat-rate vs T&M, and a worked example.
How Much Does a New HVAC System Cost in 2026?
Installed cost ranges for central AC, furnaces, heat pumps, and full systems in 2026 by size, efficiency tier, and region. What drives the price up or down, plus tax credits.
Return Air Duct Sizing: How to Size the Return Side
How to size return air ducts: why returns must match supply airflow, a return duct size chart by CFM, single vs multiple returns, filter grille sizing, and the static-pressure problems undersizing causes.
What Size Mini Split Do I Need? (Sizing Chart)
How to size a ductless mini split: a BTU-by-room-size chart, single-zone vs multi-zone sizing, why oversizing wrecks an inverter, and the adjustments that change the number.
Essential HVAC Formulas Every Tech Should Know
The core HVAC formulas in one place: sensible and latent heat, total heat, CFM, tonnage, delta T, static pressure, SEER/EER, and the constants behind them, with worked examples.