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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Furnace Flame Sensor: Symptoms, Microamp Specs and How to Clean It Safely
A furnace flame sensor proves the burners lit by reading a microamp current through the flame. We pulled the specs, lockout timing and cleaning rules from Goodman, Rheem,…
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Greenhouse Ventilation and Heating: Fan CFM, Vent Area and Heater Sizing
Size greenhouse fans, vents, pads and heaters with US extension-service numbers: air changes per minute, inlet ratios, glazing U-values, unit heater efficiency and combustion safety.
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Solar Air Conditioner: How Many Panels It Takes, City by City, With Federal Data
EIA cooling kWh divided by NREL PVWatts solar yield, city by city: how many panels a solar air conditioner needs, hybrid DC mini splits vs rooftop solar, night-time…
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Oil Heating System: How Oil Heat Works, the Efficiency Rules and the Fuel
How an oil burner fires, oil furnace vs oil boiler, the federal AFUE floors, heating oil vs kerosene vs diesel, and the New York and Connecticut bioheat laws,…
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Dual Fuel Heating System: The Switchover Math, Worked State by State
A dual fuel heating system pairs a heat pump with a gas or propane furnace. The right switchover is set by prices, not 32°F: we work it out…
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Steam Heating System Explained: One Pipe vs Two Pipe, Safety and Efficiency
How a steam heating system works, one pipe vs two pipe, the safety controls that matter, federal AFUE floors for steam boilers, where steam survives, and what converting…
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Types of Home Heating Systems: Every Kind, How Common It Is and What It Costs to Run
Every main type of home heating system, ranked by how many US homes use it in EIA’s survey, with the federal efficiency minimum for each and what a…
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Packaged Unit vs Split System: The Four Types and the Federal Rules That Differ
A packaged unit puts every component, often including a gas furnace or heat pump, in one outdoor cabinet. Federal floors match for air conditioners but are lower for…
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Hydronic Heating System: How the Water Loop Works, and What Federal Data Shows
A hydronic heating system moves heat in water, not air. How the loop works, which heat sources and emitters fit, the water temperatures that matter, and how many…
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Wall Heater Guide: Electric In-Wall Units vs Gas Wall Furnaces, Costs and Safety
Two very different appliances are sold as wall heaters. How electric in-wall units and gas wall furnaces work, what they cost to run, the federal AFUE minimums, the…