Insulation contractor in Portsmouth, New Hampshire
Looking for an insulation company near you in Portsmouth? We are a family-owned NHSaves® participating contractor with BPI-certified staff, doing attic and wall insulation, air sealing and cold-climate heat pumps across Rockingham County. Most of the insulation work is paid for by your utility's program.
What we see in Portsmouth homes
The typical Portsmouth home was built between 1950 and 1980, which usually means R-11 fiberglass batts in the walls, a thin layer of batts on the attic floor, no air sealing anywhere, and a rim joist that was never insulated. Ranches, split-levels and garrison colonials from these decades are the bread and butter of our NHSaves work: air seal and top up the attic, foam the rim joist, and the house feels like a different place.
Roughly 55% of owner-occupied homes in Portsmouth heat with natural gas, so for most households the NHSaves rebate is run by the gas utility rather than the electric one. Gas is cheaper than oil, but a leaky house still wastes a third of it, and the program's rebates are the same.
Housing figures: U.S. Census Bureau, American Community Survey 2020 to 2024 five-year estimates for Portsmouth; heating fuel shares are for owner-occupied homes.
NHSaves rebates in Portsmouth
Most of Portsmouth is served by Eversource for electricity and Unitil for natural gas. All of them are NHSaves utilities. If you heat with natural gas your Home Energy Performance rebate comes through Unitil; if you heat with anything else it comes through Eversource.
On most Home Energy Performance projects the program pays 100% of air sealing and 75% of insulation, up to $6,000 per home, and your share can go on a 0% or 2% program loan. We assess the house, model it, file with the utility and take the rebate off the invoice. How the program works.
How much fuel a Portsmouth home needs to use to qualify
| Fuel | Utility | Enrollment line | Qualifies outright |
|---|---|---|---|
| Heating oil | Eversource | 571 gallons | 857 gallons |
| Propane | Eversource | 867 gallons | 1,300 gallons |
| Natural gas | Unitil | 1,055 therms | 1,187 therms |
For a 1,800 sq ft home in Portsmouth at 7,328 heating degree days. Yearly fuel use at or above the enrollment line gets the utility’s enrollment form; above the higher figure the home qualifies with any utility. A wood or pellet stove counts toward the total. Pre-screen only: the utility’s calculator and the assessment decide.
Check your own Portsmouth home
Your ZIP code is filled in. Add your heating fuel and the heated square feet; add last year's fuel for a score, and tick the box if a wood or pellet stove helps heat the house.
Services in Portsmouth
- Attic insulation and air sealing: blower-door directed sealing of the attic floor, then blown cellulose to R-38 or better, with baffles and an insulated hatch.
- Dense-pack wall insulation for the empty cavities in older Portsmouth capes, colonials and farmhouses.
- Basement, rim joist and crawl space: closed-cell foam at the rim, sealed vapor barriers in crawl spaces.
- Cold-climate heat pumps and ductless mini-splits, sized for the house after the envelope work.
- NHSaves rebates filed with your utility and taken off the invoice.
Why Portsmouth homeowners call us
- Family owned and operated; our own crews, no subcontractors
- BPI-certified building analysts test every house before and after
- OSHA 30 trained managers and OSHA 10 trained crews
- NHSaves paperwork, permits and inspections handled for you
- Written scope and price before anything is scheduled
Questions from Portsmouth homeowners
How much does insulation cost in Portsmouth, NH?
It depends on the house, but for a typical Portsmouth home the NHSaves program pays 100% of the air sealing and 75% of the insulation, up to $6,000, so most homeowners pay a quarter of the insulation cost and nothing for the air sealing. We give you the exact figure in writing after the assessment, and 0% or 2% financing is available for your share.
Do you serve all of Portsmouth?
Yes, every neighborhood in Portsmouth (03801, 03802, 03803, 03804) and the surrounding towns in Rockingham County. Our crews are in the area weekly.
Which utility runs the NHSaves rebate in Portsmouth?
Most of Portsmouth is served by Eversource for electricity and Unitil for natural gas. All of them are NHSaves utilities. If you heat with natural gas your Home Energy Performance rebate comes through Unitil; if you heat with anything else it comes through Eversource.
Can you install a heat pump in my Portsmouth home?
Yes. We install cold-climate ductless mini-splits and ducted heat pumps across Portsmouth and Rockingham County, sized from a load calculation after the insulation work, with the Eversource heat pump rebate filed for you.
Does a wood stove count toward qualifying in Portsmouth?
Yes. The program adds up every fuel the house burns, so the cords or pellet tons you go through in Portsmouth winters count alongside oil or propane. Many homes here qualify once the stove is included.
Do you install heat pumps in Portsmouth?
Yes. Cold-climate ductless and ducted heat pumps for Portsmouth homes, sized after the insulation work so the system is not oversized, with your utility's heat pump rebate filed for you.
Nearby towns we serve
Ready to warm up your Portsmouth home?
Book a home energy assessment and find out what NHSaves will cover on your house. Our crews are in Rockingham County every week.