Equipment
Heat pumps, furnaces, air conditioners, boilers and water heaters: how they work, what they cost, how long they last and which efficiency standards apply.
-
AC Leaking Water or Blowing Warm Air: What Each Symptom Means
Water pooling indoors is a condensate drainage problem, not refrigerant: refrigerant leaves a system as gas. The distinct mechanisms behind each symptom and which are owner fixable.
-
HVAC Ductwork and Airflow: The Problem Blamed on the Equipment
If ducts are undersized, leaking or routed through unconditioned space, no amount of equipment capacity fixes the result. SEER2 raised its test static pressure precisely because duct resistance…
-
Boiler and Baseboard Heating: How It Works and Who Still Has It
Steam and hot water systems are the main heat in 6.51 million US homes, concentrated in older Northeast and Midwest housing. How they work, and why those houses…
-
What Is a Ductless Mini Split? How It Differs From Central Air
Ductless describes the distribution, not the technology. A mini split is the same refrigerant cycle as a central system with the air handler moved into the room, rated…
-
Window AC Efficiency Standards Just Jumped Up to 50%
Federal minimums for window and through-the-wall air conditioners rose between 19% and 50% for units manufactured from May 26, 2026. Every equipment class went up, with mid-size units…
-
How Often Should HVAC Be Serviced? What Is Established
No federal agency sets or measures a servicing interval. Which maintenance tasks have an established mechanism, which claims are marketing, and why a system needing annual refrigerant has…
-
AC Repair Costs: Why No Reliable National Figure Exists
Every published repair price range is a vendor survey, not measured data: four of five cost elements are tracked by nobody. What actually determines the bill and how…
-
Heat Pump vs Gas Furnace: Which Is Cheaper to Run in Your State
Cost per million Btu of heat in every state: gas beat a minimum heat pump in 32 of 41 states in 2025/26, but heat pumps win clearly where…
-
How Old Is America’s HVAC Equipment? 20% of Heating Systems Are Past 20 Years
Nobody measures age at failure, so no lifespan figure exists. The age of the installed base does: 20% of US heating equipment is past 20 years, boilers 38%,…
-
What Size HVAC System Do I Need? Why Square Footage Fails
Square-foot rules of thumb routinely oversize equipment because they ignore insulation, glazing, orientation and air leakage. What a real load calculation includes, and what to ask before you…