Reviewer
Jen Whitaker
Master electrician, NATE-certified, HVAC electrical
Jen is a master electrician focused on HVAC branch circuits, motor starting circuits, and equipment control wiring on light-commercial jobs. The master credential is the top tier of state electrician licensing, requiring seven to ten years of documented field experience as a journeyman (the exact threshold varies by state, with Delaware requiring six years or 8,000 hours, New York City requiring 10,500 hours, and most other states landing in between) plus passing the master examination on NEC code, electrical theory, complex system design, and load calculations. The license is what lets her pull electrical permits, supervise other electricians on a project, and sign off on inspector-grade work.
Jen also holds NATE certification in the HVAC electrical track. Her specific work is the intersection where electrical code meets HVAC equipment: condenser branch circuits sized per NEC Article 440 with MCA and MOCP from the equipment nameplate, motor starting capacitor selection on PSC and ECM systems, and the disconnect-plus-whip install that every condenser pad needs. She has wired condensers from 1 ton single-phase residential through 25-ton three-phase rooftop units.
Jen reviews the electrical tools on this site (wire size, breaker size, capacitor sizing, voltage drop) plus the generator sizing calculator because backup-power sizing depends on the same MCA/LRA equipment data she pulls from condenser nameplates. Every electrical recommendation gets checked against NEC 2023 Tables 310.16 and 240.6, NEC 110.14(C) terminal temperature limitation, and NEC 210.19 informational note 4 voltage-drop guidance.
Tools reviewed by Jen
Every tool listed below was reviewed by Jen Whitaker against the published code, standard, or manufacturer data it implements. Jen signs off on the math, the inputs that drive it, and the edge cases the result panel flags.
Comparison guides reviewed by Jen
Side-by-side comparisons fact-checked by Jen against field experience, install quotes, and manufacturer specs. Each guide covers a real homeowner decision, with the install cost ranges, climate fit, and edge cases verified before publication.
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Nest vs ecobee vs Honeywell
Smart thermostats by household: ecobee for Apple and room sensors, Nest for Google and auto-learning, Honeywell for a plain feel and big homes.
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Nest vs ecobee
The two-way: ecobee for Apple Home and room sensors that follow you, Nest for Google and a thermostat that programs itself. Plus the no-C-wire trap.
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40 vs 50 gallon water heater
Real first hour ratings, the fit trap with modern fatter tanks, and why the upgrade usually costs only $100 to $300 more installed.
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EcoFlow vs Jackery vs Tesla Powerwall
Portable power station or a wired-in Powerwall for home backup? Pick the class first, then a fair EcoFlow-vs-Jackery comparison and a straight Powerwall matchup against the whole-home units, with real installed cost.
Troubleshooting guides reviewed by Jen
Diagnostic walkthroughs Jen signed off on against the service calls they actually run. Each page lists the real fix order and what every repair costs.
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AC not turning on
A dead AC is usually a free fix. The thermostat, breaker, power switches, and drain safety switch checks that solve most no-cool calls, then what each repair costs.
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Window AC not cooling
A window unit that stops cooling is usually a clogged washable filter or a unit not tilted right in the window. The free fixes to try first, why it leaks water or ices up, the reset button on the plug, and the repair-versus-replace math that, on a cheap unit, usually says replace.
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Mini-split not cooling or heating
A ductless mini-split that stops cooling or heating is usually a clogged washable filter or normal defrost, not a breakdown. The free checks for each, how to read the blinking-light error codes, the water-leak and musty-smell fixes, and when a refrigerant leak or board fault means calling a tech.
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AC fan not running
Your AC has two fans, and which one stopped points to a different cause. How to tell the indoor blower from the outdoor fan, the free checks for each, why a humming unit means shut it off now, and what each repair costs.
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AC smells bad
What a musty, rotten egg, burning, chemical, dirty sock, or vinegar smell from the AC means, which two are safety emergencies to act on now, which you can fix yourself, and which need a tech.
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AC won't shut off
The house is cool but the AC keeps running. The free thermostat fan and setpoint fixes to rule out first, the bad thermostat and wiring short, the stuck contactor that runs the compressor nonstop, and how to safely cut power until a tech comes.
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AC tripping the breaker
Two free checks before paying a service call, the eight real causes ranked by how often techs find them, and the one cause almost every online guide misses: the breaker itself.
Guides reviewed by Jen
HVAC explainers covering the questions homeowners ask most, fact-checked by Jen against field experience and published code.
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AC capacitor replacement: signs and cost
The signs of a bad AC capacitor, what replacement costs installed, how to be sure it is the capacitor and not something pricier, and why this is the one AC repair to leave to a tech.
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Can a home battery run your heating and air conditioning?
What a Tesla Powerwall or other home battery can actually run: a gas furnace and a mini-split for hours, a central AC only if it can survive the startup surge, and electric heat barely at all. The runtime math, soft starts, and which battery to buy for HVAC backup.
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Which EcoFlow can run your AC or heater?
Which EcoFlow portable power station, from River to Delta Pro, runs a window AC, portable AC, gas furnace blower, or mini-split, and for how long. The three spec numbers that matter, why X-Boost will not start a compressor, and the honest limit at central air.
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Does a space heater use a lot of electricity?
Yes: 1.5 kWh and about 28 cents per hour on high, and one heater running around the clock uses more electricity than the average home does in total. The per-hour, per-day, and per-month math, what it adds to a real bill, and the habits that decide whether it costs $30 a month or $200.
How BTU Size uses reviewers
Every tool on BTU Size credits a named technician with field experience in the relevant trade. Reviewers check the math against published code (ACCA, ASHRAE, NEC, NFPA, IECC), against manufacturer engineering data (Carrier, Trane, Mitsubishi, Owens Corning, Slant/Fin), and against the edge cases that show up on real service calls. See the full reviewer roster and methodology.