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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Heat Pump Water Heaters: How They Work, What They Need and the 2029 Rule
A heat pump water heater moves heat from room air into the tank. What UEF measures, what it costs to run against an electric tank, what it needs,…
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Tankless Water Heater vs Tank: How It Works, Sizing and the 2026 Federal Rules
How a tankless water heater works, how it compares with a storage tank, how to size one by flow rate and temperature rise, and why the federal gas…
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AC Unit Cost in 2026: What Federal and National Lab Estimates Actually Show
No federal agency measures installed AC prices, but EIA, DOE and LBNL publish modelled and benchmark estimates. Here is every sourced figure, its dollar year, and how far…
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BTU Calculator: What Size Room Air Conditioner You Need, From ENERGY STAR’s Chart
A CSS lookup built on ENERGY STAR’s 14-band room air conditioner sizing chart and its four adjustments, with the ton conversion and why the chart does not apply…
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Bathroom Exhaust Fan: How to Size, Vent and Run One to Code Minimums
A bathroom exhaust fan needs at least 50 cfm intermittent or 20 cfm continuous, ducted outdoors. How to size, duct, terminate, control and verify one, from DOE, ENERGY…
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DIY Mini Split Kits: What EPA Says About Connecting Pre-Charged Lines
Pre-charged DIY mini split kits are legal to buy, but EPA’s Section 608 Q&A says connecting or disconnecting hoses or pre-charged lines during installation requires technician certification.
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Supply and Return Vents: How They Work, and Closing Them
How to tell supply from return, why closing vents raises duct pressure instead of saving energy, and why bedrooms with no return path go stale when the door…
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ERV vs HRV: Mechanical Ventilation, Explained
Tight houses need ventilation on purpose. The 5 ACH50 code threshold, exhaust-only versus supply versus balanced systems, and how moisture decides between an HRV and an ERV.
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Mini Split Repair: Leaks, Smells, Error Codes, Cleaning
Water dripping from the head, musty smells, weak airflow and blinking codes. What each usually means, what cleaning fixes, and the flare joint leak that often traces back…
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Boiler Service: What an Annual Visit Should Cover
What an annual boiler service should test for hot water and steam systems, the three safety devices that matter most, what oil boilers need, and the owner’s jobs…