🌡️ Energy Efficiency Analyzer
Enter a building's insulation, window U-factor, HVAC SEER rating, and air-sealing quality to get an efficiency score from 0 to 100 with a band.
🔧 Rate a Building's Efficiency
What is an Energy Efficiency Analyzer?
An energy efficiency analyzer combines the building envelope and its systems into a single score. It looks at how well a structure keeps conditioned air in — through insulation, window performance, and air sealing — and how efficiently its HVAC equipment runs, then weighs them into an overall rating.
Use it to see where a home or building is leaking value and which upgrade will move the needle most. It is a planning aid, not a substitute for a professional energy audit.
❓ Frequently Asked Questions
How is the energy efficiency score calculated?
The analyzer scores four areas — insulation R-value, window U-factor, HVAC SEER rating, and air-sealing quality — on a common 0 to 100 scale, then weights them: insulation 30 percent, windows 25 percent, HVAC 25 percent, and air sealing 20 percent. The weighted total becomes an overall score and a letter band from A to E.
Why do insulation and air sealing matter so much?
Together they govern how much conditioned air a building loses. Strong insulation slows heat flow through walls and roof, while good air sealing stops drafts that bypass it entirely. A leaky building wastes the work of its heating and cooling system, which is why these fundamentals carry the most weight before you even consider equipment.
What is a good window U-factor and HVAC SEER rating?
For windows, a lower U-factor is better — high-performance glazing sits near 0.20 to 0.30, while older single panes can exceed 1.0. For air conditioning, a higher SEER is better, with modern efficient units around 16 to 20 or more. The analyzer rewards lower U-factors and higher SEER ratings accordingly.
Does this replace a professional energy audit?
No. It is an educational, directional score that highlights where a building is strong or weak. A real audit uses blower-door testing, thermal imaging, and modeling to quantify savings and qualify for rebates. Use this to prioritize upgrades, not as a substitute for a professional energy audit.