Last updated: October 28, 2026
General information only
The content on homecomfortmath.com, including articles, tables and calculators, is provided for general information and planning. It is not professional engineering, contracting, electrical, plumbing, financial, legal or tax advice, and it does not create any professional relationship between you and Home Comfort Math.
Estimates, not quotes
Costs, savings, sizes and payback periods on this site are estimates based on published averages and the assumptions we state. Your actual results depend on your home, climate, equipment, installer, local prices and how you use energy. Always get written quotes from licensed contractors before you buy, and use a professional load calculation (such as ACCA Manual J) for equipment sizing.
Safety
Work on gas lines, electrical panels, refrigerant circuits, water heaters and generator connections can cause fire, injury, carbon monoxide poisoning or death if done incorrectly, and often requires a permit. Hire licensed professionals for this work, follow manufacturer instructions and local codes, and never run a generator indoors or in an attached garage.
Incentives and regulations change
Tax credits, rebates, utility programs and efficiency standards change often and vary by state and utility. We show a “Last checked” date wherever we mention them, but you should confirm current terms with the official program, your utility or a tax professional before relying on them.
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Errors
We work hard to keep our information accurate and current, but we cannot guarantee that it is complete or error-free. If you find a mistake, please tell us at contact@homecomfortmath.com. Use of this site is at your own risk, as described in our Terms of Use.