Homeowners
Plain-language cost guides for homeowners: repair versus replace, running costs by state, safety, and how to read an HVAC contractor’s quote.
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Radiant Barrier: What Field Tests Show It Saves, and When It Pays Back
Field tests and ORNL modeling show radiant barriers save most in hot climates with ducts in the attic. Here are the numbers by city, the air gap rule…
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Infrared Heater Explained: Types, Electricity Use, Where It Wins and Safety Rules
How an infrared heater works, the quartz, carbon, panel and gas tube types, why a 1,500 watt unit uses the same 1.5 kWh an hour as any electric…
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Spray Foam Insulation: Open vs Closed Cell, R-Value, Code Rules and Real Risks
Spray foam insulation explained from federal and code sources: open cell vs closed cell properties, why R per inch does not scale, thermal barrier and unvented attic rules,…
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Smart Vents: What the Closed-Register Research Says, and When They Work
Smart vents can fix one or two uneven rooms, but federal lab research shows closing registers on leaky ducts costs energy. We put the LBNL evidence next to…
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Thermostatic Mixing Valve: How It Works, ASSE 1017 vs 1070 and What Code Requires
How a thermostatic mixing valve works, why a valve at the water heater does not replace the shower and tub devices code requires, and how to fix drift…
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Ducted Mini Split: Static Pressure Limits, Ratings and Duct Design Rules
A ducted mini split hides the indoor unit and feeds a few rooms through short ducts. Here are the maker static pressure limits, how its ratings compare with…
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Electronic Air Cleaner: How It Works, Ozone, Cleaning and MERV
An electronic air cleaner charges particles and collects them on washable plates. We checked the ozone numbers, CARB rules, Honeywell and Trion cleaning guidance and the MERV 13…
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Indirect Water Heater: How It Works, Sizing, Priority Zones and Federal Rules
An indirect water heater is a boiler-heated storage tank with no burner of its own. How the coil and priority zone work, how to size one by first-hour…
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Aquastat Explained: High Limit, Low Limit, Differential and Boiler Settings
What an aquastat does, how high limit, low limit and differential work, and what the Resideo, Beckett and Hydrolevel manuals and state codes actually say about settings and…
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Where to Put a Thermostat: Height, Walls and Vents, From the Manuals
Where to put a thermostat, from Resideo, ecobee and Google Nest manuals plus the 2010 ADA Standards: the 5 ft vs 48 in. height question, vents, exterior walls,…