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.
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What the AC Condenser Does, and What Actually Fails in It
The outdoor cabinet holds the compressor, condenser coil and fan. Its whole job is rejecting heat to outdoor air, which is why the most common problem is a…
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MERV Ratings: Why the Highest Filter Is Not the Best Filter
Filtration and airflow pull against each other. A one inch filter at a high MERV rating is where problems concentrate, because area is small and restriction is high.
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Why a Furnace Will Not Ignite: The Sequence and Where It Stops
Most no-heat calls are the furnace correctly refusing to run. The ignition sequence has six interlocks, and knowing which one stopped tells you whether it is a filter…
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Why Your House Is Cold but Humid (and Why a Bigger AC Makes It Worse)
Dehumidification is a function of run time, not capacity. A system that cools quickly and shuts off leaves the house clammy, which is why adding capacity to a…
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Why Single-Hose Portable Air Conditioners Underperform
A single-hose portable exhausts conditioned room air outdoors, which pulls unconditioned air in through every gap to replace it. That is design, not defect, and dual-hose units avoid…
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Gas Furnaces Must Hit 95% AFUE From December 2028
Non-weatherized gas furnaces manufactured from December 18, 2028 must reach 95% AFUE, up from 80%. That effectively requires condensing equipment, and the venting conversion is the real problem.
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What Is R-454B? The A2L Refrigerant That Replaced R-410A
R-454B is what most manufacturers moved to after the 700 GWP threshold bit on January 1, 2025. The A2L classification, not the GWP, is what changes handling, tooling…
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What Ventilation Actually Means in HVAC (and What It Does Not)
Circulation, filtration and air exchange get called the same thing. Only one is ventilation. Why a denser filter does nothing for fresh air, and why tighter construction made…
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How Thermostats Actually Work, and What They Cannot Do
A thermostat controls whether the system runs, not how hard. On single stage equipment, setting it lower does not cool faster, it only extends run time. Placement matters…
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Water Heater Shipments Fell on Both Fuels in 2026
Gas storage shipments fell 2.5% and electric 5.2% year to date through July. Plus why no single minimum UEF figure exists: the standard is a formula that varies…