Why New Hampshire attics need this
The New Hampshire summer is shorter than Texas, but the attic does not know that. The state's average July high is around 80°F, and on the first real heat wave the deck under your shingles cooks. NH attics routinely hit 128°F to 130°F on plain July afternoons. We have pulled probe readings of 128°F in Manchester and Nashua homes when the outdoor air was only 86°F. That heat radiates straight down through the ceiling drywall into the bedrooms below, all evening long. The upstairs in a typical NH colonial sits 10°F to 15°F hotter than the downstairs from late June through August. Insulation slows it down. It does not stop it.
The winter side is the second pitch, and it is a strong one. NH winters are long and indoor humidity builds up. Showers, cooking, dishwashers, and just breathing put gallons of water vapor into the air every week, and a lot of that vapor rises into the attic and freezes on the cold underside of the deck. At the same time, warm attic air leaks up from the living space, warms the deck, melts snow on the shingles from below, and feeds the ice-dam cycle at the eaves. NH adjusters from Manchester to the Lakes Region write up this claim every winter.
A solar attic fan does both jobs on one piece of equipment. In July it moves the trapped 130°F air out and cools the deck dramatically. In February the panel is making power the moment the sun clears the snow, and the fan is pulling moist air out before it freezes on the deck. Sun runs it year-round. No operating cost added to your bill.
What we install
You get one solar attic fan and a New Hampshire authorized installer who handles the install. The unit is a 30W solar fan with its own solar panel built into the housing. It mounts on the back slope so it does not show from the road, which keeps you on the right side of Portsmouth, Hanover, and Peterborough historic-district rules. The installer cuts a clean opening, flashes it for Nor'easter wind-driven rain, runs a thermostat and a humidistat, and finishes the install.
Professional install in a single visit. No electrician. No new circuit. No operating cost added to your bill. The sun runs it.
What you'll save
Summer cooling is the first dollar win. The average New Hampshire home uses about 7,900 kWh per year, and a typical NH summer power bill sits around $145 in July. A solar fan trims 8 to 15 percent off summer cooling cost (per U.S. Department of Energy residential cooling-load guidance), which is $12 to $22 a month back from June through August. The bigger summer payoff is comfort. The upstairs becomes sleepable in the evening because the ceiling stops radiating attic heat down into the room.
The other wins stack on top. Shingle life on a deck that is not cooking at 130°F all summer and refreezing all winter extends five to ten years. Ice-dam interior damage runs $4,000 to $10,000 per claim. Mold remediation when wet insulation goes too long runs $3,000 to $8,000. And because your insulation stays dry, your heating bill drops too. In a state where most homes burn oil or propane, that adds up fast.
Real New Hampshire install scenarios
Strawbery Banke area, Portsmouth. A 1905 four-square three blocks from the river. The owners had been chasing ceiling stains in the upstairs guest room every February for years. Soffit venting was painted shut from a 1970s re-side. We mounted the solar fan on the back slope above the rear ell where it would not be visible from the street, and the installer cut new soffit vents to feed the intake side. Next winter, no stains. The owners said the upstairs felt less stuffy in summer too, which they had not expected.
A lake camp converted to year-round, near Wolfeboro. A 1965 cape with finished knee-walls upstairs, originally built as a summer place. Indoor moisture had nowhere to go in winter and was condensing heavily on the rafters. The previous winter, the deck had developed visible mold in two spots. Install went on the back slope where the long afternoon sun would catch the panel. Within two months the rafters were dry. The owner repainted the affected deck spots in the spring and they have stayed clean since.
Keene, off Court Street. A 1928 Tudor revival with a steep slate-converted-to-asphalt roof. The owner had paid for a roof rake service every January for six years and was tired of it. Ice ridges formed at every dormer. The solar fan went on the back slope above the kitchen ell. The first winter after install, he canceled the roof rake contract. He also reported his propane heat bill dropped by about $40 a month, which he traced to drier, better-performing insulation.
Installed by New Hampshire authorized installers
New Hampshire housing stock leans old, and a lot of it was built before modern attic-ventilation math existed. Original soffits are often painted shut, sealed by a re-side, or stuffed by blown-in insulation. Our installers always check the intake side before they cut for a fan, and they will tell you if the soffits need work before the fan can do its full job.
Portsmouth, Exeter, Hanover, Peterborough, Wolfeboro, and most lake-region towns have rules about street-facing roof equipment. Back-slope mounting clears almost every one. You pick a date, the installer shows up, and the attic stops freezing and dripping all winter.
