Insulation & air sealing
Attic, walls, basement and rim joist, with the air sealing that makes it work.
- Blower-door tested before and after
- Most of the cost paid by NHSaves
- Fixes ice dams and drafty rooms
Southern New Hampshire · family owned since 2012
A warmer house. A lower heating bill. No runaround.
Insulation, air sealing and cold-climate heat pumps for southern New Hampshire homes. Your utility pays for most of the insulation through NHSaves®. We handle the paperwork.
BPI certified staffOSHA 10 & 30 trainedOur own crews, no subcontractorsA person answers the phone
NHSaves® Home Energy Performance
Your utility pays for most of it. We do the paperwork.
You already pay into NHSaves on every electric bill. We test the house, file with your utility, and the rebate comes straight off our invoice.
100%of air sealing covered on most projects
75%of insulation covered on most projects
$6,000maximum rebate per home, plus 0% to 2% financing
NHSaves® is the energy-efficiency program of New Hampshire's electric and natural gas utilities: Eversource, Liberty, Unitil and the New Hampshire Electric Co-op. Program eligibility requirements and restrictions apply. Rebate amounts are set by the utility program, depend on each home's assessment results, and are subject to change or cancellation while funding is available. Granite Hearth Home Performance is an independent contractor and does not sponsor or operate the NHSaves programs.
- About $5,200 from the program100% of air sealing, 75% of insulation, up to $6,000
- About $2,800 your share0% or 2% program loan if you want one
What we do
Two trades, one crew, one plan for the house.
Air leaks and thin insulation first. Equipment second.
Heat pumps & mini-splits
Cold-climate ductless and ducted systems sized for the house. Heat in January, cool in July.
- Rated for New Hampshire winters
- Utility rebates filed for you
- Insulate first, then right-size
NHSaves® rebates
100% of air sealing and 75% of insulation, up to $6,000, taken off your invoice.
- We file with your utility
- 0% or 2% loans for the rest
- Heat pump rebates too
Where the heat goes
Four places, one fix each.
- AtticSealed, then blown to R-49 and up
- WallsDense-packed through small holes
- Rim joistClosed-cell foam at the leakiest framing
- Heat pumpSized after the house is tight
On the job
What the work looks like.
.jpg){kind=link}
.jpg){kind=link}
Does your home qualify? Check in a minute.
Type your ZIP code, your heating fuel and the size of the house. We look up your utilities from the ZIP code, apply that utility’s cut-off, and tell you how much fuel a house your size has to use in a year to qualify.
How it works
From first call to certificate in four steps.
Home energy assessment
Blower door, infrared camera and a safety check of the heating equipment.
Plan and rebate approval
Scope, rebate and your share in writing. Nothing is scheduled until you say so.
Our crew does the work
Our own employees, usually one or two days, house left cleaner than we found it.
Test out and certificate
We retest, show you the before-and-after numbers and hand you the certificate.
Why homeowners choose us
Certified, trained and family run.
NHSaves Participating Contractor
Approved to deliver Home Energy Performance assessments and weatherization through NHSaves, the energy-efficiency program of Eversource, Liberty, Unitil and the NH Electric Co-op.
BPI Certified Staff
Building Analysts and Envelope Professionals certified by the Building Performance Institute test and diagnose the whole house before and after the work.
OSHA 10 and 30 Trained Managers
Every crew is run by an OSHA 30 trained manager, and every installer carries OSHA 10 training.
Family Owned and Operated
Owned and run by one New Hampshire family. The people who answer the phone are the people who stand behind the work.
Where we are booking this season
Older homes, oil and propane heat: the towns where the program does the most good.
104 towns in four counties. Tap yours for its utilities and the fuel a home there needs to qualify.
- Booking now
- Towns we serve
- Rest of New Hampshire
Town boundaries: U.S. Census Bureau 2024 cartographic boundary files. Tap or hover a town for its name; shaded towns open their page.
SalemRockingham County56% of homes built before 1980 · 84% heat with oil or propaneKeeneCheshire County72% of homes built before 1980 · 78% heat with oil or propaneRochesterStrafford County52% of homes built before 1980 · 76% heat with oil or propaneHollisHillsborough County52% of homes built before 1980 · 84% heat with oil or propaneHillsboroughHillsborough County66% of homes built before 1980 · 78% heat with oil or propaneFarmingtonStrafford County56% of homes built before 1980 · 88% heat with oil or propaneKingstonRockingham County45% of homes built before 1980 · 95% heat with oil or propaneHinsdaleCheshire County72% of homes built before 1980 · 86% heat with oil or propaneFitzwilliamCheshire County62% of homes built before 1980 · 76% heat with oil or propaneRollinsfordStrafford County65% of homes built before 1980 · 86% heat with oil or propaneNew CastleRockingham County55% of homes built before 1980 · 97% heat with oil or propaneTroyCheshire County69% of homes built before 1980 · 77% heat with oil or propaneWalpoleCheshire County62% of homes built before 1980 · 88% heat with oil or propaneGilsumCheshire County58% of homes built before 1980 · 78% heat with oil or propaneRyeRockingham County56% of homes built before 1980 · 88% heat with oil or propaneAtkinsonRockingham County50% of homes built before 1980 · 74% heat with oil or propaneCandiaRockingham County51% of homes built before 1980 · 87% heat with oil or propaneManchesterHillsborough County65% of homes built before 1980 · 45% heat with natural gasNashuaHillsborough County60% of homes built before 1980 · 73% heat with natural gasDoverStrafford County55% of homes built before 1980 · 43% heat with natural gasGoffstownHillsborough County46% of homes built before 1980 · 79% heat with oil or propane
Find your town Hillsborough County · Rockingham County · Strafford County · Cheshire County
Homeowner guides
Learn what your house is doing before anyone sells you anything.
No-cost and low-cost ways to cut your heating bill
Twelve things for this weekend, three that need a crew.
Read the guideHeating cost calculator
Oil, propane, gas, wood and a heat pump, priced on the same heat with your own numbers.
Try itRebates, financing and forms
Every New Hampshire program in one place, and what we handle for you.
See the listQuestions
Straight answers before you call.
Not here? Call (603) 555-0100. A person who has crawled through an attic will pick up.
How much does NHSaves cover?
On most projects 100% of air sealing and 75% of insulation, up to $6,000, with 0% or 2% financing for the rest. Your utility sets the exact figure from the assessment. See our NHSaves page.
Do I have to be an Eversource customer?
No. Eversource, Liberty, Unitil and the New Hampshire Electric Co-op all run NHSaves. Gas heat goes through your gas utility; everything else through your electric utility.
I heat partly with a wood stove. Does that count?
Yes. The program adds up every fuel the house burns, so a few cords a year often tips a borderline home over the line. The calculator above has a box for it.
Let's take a look at your house.
It starts with a phone call at no cost. We tell you plainly what the house needs, what NHSaves will cover and what the rest will cost, in writing, before anything is scheduled.