Insulation & air sealing
Stop heating the sky. Seal it. Keep it.
Most American homes leak like a screen door — through thin attics, empty walls and a thousand small gaps. Insulation and air sealing is the highest-ROI upgrade in home energy, and in many states the majority of the cost is covered by efficiency programs.
The problem
What the old way costs you.
You're paying to condition outdoors
An under-insulated attic lets your expensive heated and cooled air pour straight out through the roof, all year long.
Drafts your thermostat can't fix
Gaps around rim joists, attic hatches, plumbing and wiring add up to the equivalent of a wide-open window in many homes.
It sabotages your HVAC
A leaky envelope forces even a brand-new system to run longer and harder — you bought efficiency and the house is throwing it away.
The Nu way
What you get instead.
Up to 15% off heating & cooling
EPA estimates air sealing plus attic insulation saves about 15% on heating and cooling — every year, forever.
Comfort you can feel in a day
Even temperatures upstairs and down, no more drafts, warmer floors, cooler summer bedrooms — immediately.
Quieter, cleaner air
A sealed envelope blocks street noise, dust and pollen along with the drafts.
The most-subsidized upgrade
Efficiency programs love insulation — in several of our states, programs cover most of the insulation cost for eligible homes.
What's included
Done right, end to end.
- Free envelope assessment — attic depth, air-leak points, insulation levels
- Air sealing of attic penetrations, rim joists and major gaps
- Attic insulation brought to recommended R-value for your climate zone
- Program-eligible work scoped to maximize state and utility coverage
- Installation by vetted, insured local insulation pros
- Before/after documentation for your records and rebate filings
In some states, this is nearly free
Insulation is the fastest payback in home energy — it makes every heating and cooling system you own cheaper to run from day one. And in Massachusetts, Mass Save has historically covered a large majority of approved insulation costs for eligible homes; we scope the work to match the program's rules and file it for you. Elsewhere, your plan shows the payback math and flags any local incentives.
See how we capture rebatesFAQ
Insulation & Air Sealing — straight answers.
How do I know if my insulation is inadequate?
Why do air sealing and insulation go together?
Does this help in hot climates too?
Ready to see the numbers for insulation & air sealing?
Get your free Home Efficiency Plan — the systems worth upgrading, conservative savings estimates for your address, and every rebate you qualify for.
Talk to a real efficiency advisor — no pressure, no door-knockers.