Tell Us About Your Home and Bills
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Where Your Energy Dollars Go
Your Personalized Priority List
Based on your home's age, insulation level, and climate — here's what will have the biggest impact, in order:
Air Sealing — Attic Floor & Rim Joist
Your home's age suggests significant air leakage. Sealing bypasses in the attic floor and rim joist is the highest-return improvement in most older homes.
Estimated potential: $317–$403 / year
Attic Insulation Upgrade
Your current insulation level is well below DOE recommendations. Adding insulation after air sealing delivers the next-biggest return on the heating and cooling budget.
Estimated potential: $168–$264 / year
HVAC Tune-Up or Upgrade
After reducing your home's load with air sealing and insulation, evaluate whether your heating and cooling equipment is right-sized and operating efficiently.
Impact varies — have equipment tested for efficiency and duct leakage
Water Heating Upgrade
If you have an older electric resistance water heater, a heat pump water heater delivers 2–3× the efficiency for the same hot water.
Estimated potential: $194–$259 / year
The Right Order of Improvements
Building science professionals follow a specific sequence when improving a home's energy performance. The order matters because each step affects the next.
1. Air seal first. Close the uncontrolled leaks — especially in the attic floor and rim joist. Air carries heat much faster than conduction, and no amount of insulation fixes a bypass.
2. Insulate on top of sealed surfaces. Once bypasses are sealed, insulation performs at its rated value. Attic floor insulation delivers the highest return in most climates.
3. Right-size and upgrade HVAC. With a reduced load from steps 1 and 2, you may need smaller equipment. Any system now runs in longer, more efficient cycles in a tighter home.
4. Address water heating. Heat pump water heaters deliver 2–3× the efficiency of standard electric units and are one of the highest-return appliance upgrades available.
5. Lighting and appliances. LED lighting is already cheap and widely adopted. Appliance upgrades make sense at natural replacement time.
Common Questions
What is the single most effective thing I can do to lower my energy bills?
In most older homes, air sealing delivers the greatest impact per dollar spent. Uncontrolled air leakage is often responsible for 25–40% of heating and cooling costs — and it can be addressed with low-cost materials like caulk, spray foam, and weatherstripping.
Why does my home feel uncomfortable even with the thermostat set correctly?
Thermostat comfort and actual comfort are different. Radiant comfort depends on the temperature of surrounding surfaces — walls, ceilings, windows, floors — not just air temperature. Cold surfaces make a room feel cold even at 70°F. Improving the building envelope addresses the root cause.
Are smart thermostats worth it?
They help, but they're not a substitute for fixing the building envelope. A smart thermostat optimizes when you use energy — but if your home is leaky and under-insulated, it's optimizing a broken system. Fix the envelope first; then a smart thermostat amplifies those gains.
What does a professional energy audit actually tell me?
A comprehensive energy audit by a BPI-certified analyst includes a blower door test (measures actual air leakage), duct leakage test, combustion safety testing, insulation inspection, and a prioritized improvement report. It takes the guesswork out of where to spend your money and is often required to access utility rebate programs.
How to Read Your Utility Bills to Find the Energy Leak
Your energy bills contain more diagnostic information than just the total due. The most useful comparison is seasonal baseline analysis: take your two or three lowest monthly bills of the year (usually May and October in most climates — when you're neither heating nor cooling much) and average them. That average is your baseline load — the electricity your house uses for everything that runs regardless of weather: water heating, appliances, lighting, standby power. Everything above that baseline in winter is heating. Everything above it in summer is cooling.
Once you have your baseline, you can calculate your heating and cooling costs directly: add up the "above baseline" dollars from your cold months and you have your annual heating cost; do the same for your hot months and you have cooling. This is more accurate than guessing percentages because it's derived from your actual bills. Most homeowners are surprised by how high their heating number is once they isolate it from baseline usage — it's usually the largest single category in cold climates.
A second useful signal is year-over-year comparison. If your bills are increasing faster than your local utility rate increases, one of three things is happening: your building envelope is degrading (insulation compressing, new air leaks forming from settling or renovation), your appliances and equipment are aging and becoming less efficient, or your household usage is growing. Comparing months with similar weather to prior years removes the weather variable and makes it easier to see these trends. Most utilities now provide 12-month history online, and some show degree-day-adjusted comparisons so weather differences don't obscure the underlying trend.
Rick's Take — From the Field
When I'd walk into a home as a BPI Certified Building Analyst, I'd always look at three things first: the utility bills, the attic, and the water heater. The bills told me what the house was costing. The attic almost always told me the biggest reason why — either no air sealing, thin insulation, or both. And the water heater told me what was competing with the building envelope for the largest share of the energy dollar.
In 90% of homes built before 1990, the priority list looked the same every time: seal the attic bypasses, add insulation on top of the sealed surfaces, then assess the ductwork if it ran through an unconditioned attic or crawl space. Equipment conversations came after that. Not before. When homeowners had already replaced HVAC before addressing the envelope, the bill savings from the new equipment were consistently smaller than expected — because the house was still losing heat through the same leaks as before.
The sequencing isn't just theoretical. Fixing the envelope first reduces the load, which changes what equipment you need. I've seen homeowners talk to contractors about a 100,000 BTU furnace replacement, then after a proper air seal and insulation job, discover they only needed a 60,000 BTU unit. The envelope work paid for itself partly through the cheaper equipment. That's how the sequence is supposed to work.