How much you get
$400–$800 — no standalone Mass Save program for HRVs on their own, but there's up to a $500 instant discount on qualifying equipment, or $400–$800 when the ventilation work is paired with a weatherization project.
Why ventilation matters after air sealing in Lawrence
Once you air-seal an older triple-decker or multi-family building — common in Lawrence's mill-city housing stock — the building holds heat better but also traps stale air and moisture more than it used to. That's the reason Mass Save pairs the HRV/ventilation incentive with weatherization work rather than offering it as a standalone rebate: it's meant to follow the insulation project, not replace it.
Understanding your HRV/ERV
What an HRV actually does: it swaps your indoor air for outdoor air continuously, and instead of just dumping the heat in the exhausted air, it runs both streams through a core that transfers most of that heat into the incoming fresh air first. Lawrence's mill-era housing, dense, older multi-family buildings that make up a lot of the city's stock, wasn't built airtight to begin with, so leakage used to do this venting job for free. Once National Grid-funded weatherization seals that up, an HRV or ERV is what takes over.
HRV vs. ERV: the difference is moisture. A standard HRV recovers heat only; an ERV recovers moisture along with it. Lawrence sits among the colder cities in this cluster, with indoor air prone to getting dry once the heating season is a few weeks in. That's the case where an ERV's moisture recovery tends to matter more than in a milder coastal city. Have your contractor weigh it against your specific unit's layout rather than assuming one is automatically right.
On efficiency: Lawrence's average January low has run -5.9°C over the past decade, with a coldest day of -26.7°C, putting it toward the colder end of what counts as "moderate cold" for HRV performance, roughly the -15°C to -25°C range where real-world recovery typically sits around 60-75%. Push past that into the coldest stretches of a Lawrence winter and recovery drops further, and the unit will spend more time in defrost mode, briefly reducing airflow to clear frost off the core.
The question that comes up constantly is whether to just shut it off when it's freezing out, since it feels like the unit is bringing cold air straight into the house. It isn't wasting the heat. Most of it's already been recovered before that air reaches your rooms. So running it low or on an intermittent cycle through winter is the standard, professionally recommended approach rather than turning it off. Switch it off entirely in an airtight Lawrence home and moisture from cooking, showers, and daily living has nowhere to go, which is how condensation and eventually mold show up on cold surfaces. Also worth knowing: an HRV isn't a substitute for a bathroom exhaust fan, since it can't move air fast enough to clear a shower's steam on its own.
Check any unit you're considering against Natural Resources Canada's ENERGY STAR certified HRV/ERV products list before buying, and see NRCan's plain-language explainer for more on how these systems work.
How to claim it
- Schedule your free Mass Save home energy assessment (National Grid customers can also call 1-866-527-7283 directly)
- Get quotes from Mass Save-participating contractors serving Lawrence
- Work is installed
- Contractor or you file the rebate paperwork with Mass Save
- Rebate is applied at point of sale or reimbursed within weeks
Finding an installer in Lawrence
We're still building our verified installer network in Lawrence, so we don't have vetted local companies to list here yet. Browse our full directory of vetted installers across Massachusetts — several serve the wider Merrimack Valley, including Lawrence.
Browse the full Massachusetts installer directory →
Common questions
Does Mass Save offer a standalone HRV rebate in Lawrence?
No. There's up to a $500 instant discount on qualifying equipment on its own, or $400–$800 when it's paired with a weatherization project.
Should I get an HRV before or after insulation work?
Pair it with your weatherization project — that's how the $400–$800 tier applies, and it's the sequence Mass Save's own program is built around.
Your utility: National Grid
National Grid is the local electric utility for Lawrence. The HRV rebate above comes from a state-wide program, so which utility bills you doesn't change what you qualify for. Where it can matter: National Grid is who to contact about your home's electrical service capacity if your installer flags an upgrade, and who bills the electricity your new equipment uses once it's running. Some utilities layer their own incentive on top of the state rebate — worth a quick call to National Grid to ask directly.
Why ventilation matters more in Lawrence's winters
Lawrence's average January daily low over the last 10 winters (2015-2024) has been -5.9°C, with a coldest recorded day of -26.7°C. Colder outdoor air holds less moisture, which is exactly why a well-sealed Lawrence home needs mechanical ventilation in the first place — without an HRV, that sealed-up house traps humidity indoors instead of exchanging stale air for fresh air without losing the heat you paid for.
Next steps
View all Lawrence rebate programs → or check the official Mass Save site → for the current source of truth.