HVAC, Plumbing & Electrical in Dover, NH

The Garrison City on the Cochecho

Dover is the oldest permanent settlement in New Hampshire, put down in 1623 where the Hiltons built the fortified log houses that earned the nickname the Garrison City. The Cochecho River drops thirty-four feet at the falls downtown, and that water power built the Cocheco Manufacturing Company cotton mills whose brick blocks still line the river as lofts and offices. That history shapes the homes we service here: dense mill-worker housing packed tight near downtown, tall Victorians up toward Garrison Hill, and newer subdivisions on the edges of Strafford County. Add a tidal, Seacoast climate near Great Bay, and the heating, plumbing, and electrical problems in Dover are specific. We fix them the same way, one call at a time.

Seacoast winters and the nor'easter that finds old oil heat

Winter on the Dover Seacoast means nor'easters rolling off the water, ice storms, and stretches well below zero, and that is exactly when an aging oil boiler in an 1800s mill house decides it has had enough. Old systems in these homes were often oversized decades ago, then patched, and they short-cycle and fall behind on the coldest nights. We run a real Manual J load calculation instead of guessing off the old nameplate, so a replacement is sized to the actual house. We service oil and gas heat before the season, not during the first storm, because a burner that gets cleaned and tuned in October is the one still running when the next coastal storm buries Garrison Hill in snow.

Cold-climate heat pumps and humid Great Bay summers

Modern cold-climate heat pumps hold their efficiency far below zero now, so Dover homes can lean on electric heat through most of a Seacoast winter and keep oil as backup. Summers off Great Bay run humid, and humidity is where sizing goes wrong: an oversized air conditioner chills the air fast and shuts off before it pulls the moisture out, leaving the house cool and clammy. We size to the real load and set up dehumidification properly. For the mill lofts downtown and the old homes that never had ductwork, ductless mini-splits deliver heating and cooling without cutting channels through original plaster, brick, and trim, room by room where they are actually needed.

City water downtown, bedrock wells at the edges

Most of Dover proper runs on municipal water and sewer, drawn from the city's aquifer wells, so downtown and the mill-district homes usually need pressure work, filtration for taste and chlorine, and water heater service rather than a whole treatment system. Head out toward the outlying edges of town and many homes pull from private bedrock wells, and New Hampshire granite means arsenic, plus hardness and manganese, show up more often than owners expect. We test private wells for arsenic and the rest, then build the right treatment: point-of-entry arsenic removal, softening for hard water, and neutralizers where the water runs acidic. Downtown or out on a well, we match the fix to your actual supply.

Tidal low ground and the wet Dover basement

Below the center of Dover the Cochecho turns tidal on its way to the Piscataqua, and the low ground near the river and Henry Law Park sits close to a high water table that rises with heavy rain and spring melt. That is why so many older Dover basements take on water. We install sump systems built for real Seacoast weather, with battery or generator backup so the pump keeps running when a nor'easter knocks the power out, which is exactly when the basement is filling. We also fix the causes water finds: failed grading, buried downspouts, and cracked foundations in century-old homes. A dry basement here is a designed system, not luck against the tide.

Fuse boxes and knob-and-tube in the mill-era homes

The 1800s mill housing and the Victorians around Garrison Hill were wired for a few lights, not for heat pumps, EV chargers, and a modern kitchen, so we still open panels in Dover and find fuse boxes, knob-and-tube runs, and sixty- or hundred-amp services stretched past their limit. We upgrade to 200-amp panels and rewire carefully, because these houses have original plaster, trim, and tight balloon-framed walls that deserve to be protected, not torn open. We fish new circuits with the least damage possible and label everything honestly. When you want an EV circuit or the load for electric heat, we make sure the service and the wiring behind the walls can actually carry it.

Storm outages and whole-home standby power

Coastal storms and ice take Dover's power down every year, and an outage is more than dark rooms when your low-lying home depends on a sump to stay dry and a heat source to keep pipes from freezing. We install whole-home standby generators that start on their own the moment the grid drops, sized to carry what actually matters: the sump, the heat, the well pump out in the county, the refrigerator, and enough of the house to ride out a multi-day nor'easter. For homes down near the tidal Cochecho, backup power is not a luxury, it is the difference between a flooded basement and a dry one. We handle the gas, the pad, and the transfer switch.

One call instead of five in Dover

Most Dover homeowners keep separate numbers for the furnace, the plumbing, the well, and the electrician, and every one of them points at the other when something goes wrong. High Ground is HVAC, plumbing, and electrical under one veteran-owned roof, served by our New Hampshire branch, so a heat pump, a flood sump, and a panel upgrade are one visit and one company standing behind the work. We schedule same-day where the day allows, pull the proper Dover permits, and coordinate inspections instead of leaving that to you. Every job carries our lifetime workmanship guarantee. One call replaces five, and the work is done right the first time, from downtown to the edges of the Garrison City.

What we get called for in Dover

The work that comes up most around here. Same team, same guarantee, whichever one you need.

• Water Treatment - Cleaner, safer water for your whole home.
• Generator Install - Keep your home powered no matter what.
• Boiler Repair - Restore heat fast with reliable service.
• Heat Pumps - Repair or replace modern heat pumps.
• Furnace Repair - Restore heat fast with reliable service.
• Panel Upgrades - Boost home power and improve safety.
• Oil-to-Gas Conversion - Upgrade your home to use modern, efficient fuel.
• Water Heaters - Repair or replace tank and tankless units.

We also serve near Dover

Same team, same guarantee, a short drive away. Find your town for the local details.

• Madbury, NH
• Somersworth, NH
• Berwick, ME
• Durham, NH
• South Berwick, ME
• Newington, NH