Frequently Asked Questions

Yes, it's most of what we do. Multi-boiler plant installs, commercial water heaters, process gas piping for food-production and chemical facilities, and mechanical work for multi-residential buildings, all under one master plumber licensed in NH, MA, and ME.

That's the exact problem we built the company around. Master plumber licensure in NH, MA, and ME plus NH gas fitting means a Haverhill triplex and a Dover duplex get the same vendor, one invoice format, and per-property records.

The emergency line is answered around the clock, and facility calls are triaged by what the downtime costs you, not by where you sit in a call queue. Plant-room failures get a master plumber on the phone, then a crew.

Yes. We pursue mechanical subcontract work with prime contractors at federal installations in our NH, MA, and ME footprint under NAICS 238220. Our Government page lists licensure, markets, and where to send sub bids.

Yes. Cold-climate Mitsubishi H2i units are rated to keep heating at 13 degrees below zero, and Maine, the coldest state in the region, is one of the heaviest heat pump adopters in the country. Most of our installs keep the existing boiler as backup for the worst nights, because that's what we'd do in our own houses.

The honest answer comes from a heat-loss calculation on your actual house, not a national BTU chart. Oversized units short-cycle and die young, undersized units run flat out and disappoint. We size from the math and show you the numbers.

Run the conversion math first: what you pay per year on oil or propane versus the heat pump's cost to run, minus your state's potential rebate. For many oil-heated homes the swap pays for itself, and keeping the old system as backup covers the deep-cold nights. We show you the math for your house before you decide.

Typical seacoast range: $4,400 to $11,400 installed for a single zone, and $12,000 to $24,000 for multi-zone systems, confirmed at your site visit. Budget brands land low, Mitsubishi hyper-heat by a Diamond Contractor lands in the upper half and earns it.

Yes. The federal 25C credit ended for equipment placed in service after December 31, 2025, and it is not available in 2026. What's real now: NHSaves rebates in NH, Mass Save up to $8,500 in MA, and Efficiency Maine tiers up to $9,000. Program rates verified July 2026.

Standard NHSaves rebates run $250 per ton up to about $1,250 on qualifying equipment installed by the end of 2026. The enhanced $2,000 per ton rate applies only when replacing permanent electric-resistance heat, and it requires pre-verification at NHSaves.com/GetVerified before install. We handle the paperwork and take eligible rebates off the top.

Mass Save pays up to $8,500 on qualifying whole-home heat pumps, income-based enhancements reach $16,000, and the 0% HEAT Loan finances up to $25,000 over 7 years. JP Karos is a Mass Save Heat Pump Installer Network contractor, and we show the potential range beside the gross price and confirm eligibility before you sign.

It shows the honest low, typical, and high band for your kind of swap, based on published regional ranges. The exact figure is confirmed at your site visit, where we measure instead of guess. The band tells you today whether the project fits your budget.

Yes, and every monthly figure we show comes with its APR and term printed beside it, computed from one amortization formula. Massachusetts homeowners may also qualify for the Mass Save HEAT Loan, 0% up to $25,000 over 7 years.

Very few contractors hold credentials on both sides of the border, which is exactly why we do. JP Karos carries NH gas-fitting licensure plus full Massachusetts and Maine plumbing licensure, so permitted gas work doesn't stop at the state line.

Yes. No heat, burst pipes, and no-hot-water calls get answered around the clock, across all three states we're licensed in. If you smell gas, call your utility and 911 first, then call us for the repair.

The NH seacoast and Lakes Region, the Merrimack Valley and northeastern Massachusetts, and York County Maine. Licensed in all three states, based in East Hampstead and moving to the Portsmouth area.

Typical seacoast range: $4,800 to $11,800 installed, driven mostly by the gas line and venting work your house needs, confirmed at your site visit. If tankless isn't worth it for your usage, we'll say so and quote the tank too.

When parts get scarce, the heat exchanger starts going, or repair bills show up every season. Age 15 to 25 is the decision window. If it can be fixed, we fix it, and we tell you plainly when the math flips to replacement.