ERV Air Exchange System Installation
An Energy Recovery Ventilator (ERV) brings fresh outdoor air into your home while recovering energy from the stale air it exhausts, keeping your indoor environment healthy without wasting the heating or cooling you have already paid for. Southern Maine Heat Pumps installs ERV air exchange systems that work seamlessly with your heat pump to maintain excellent indoor air quality, control humidity, and reduce allergens and pollutants year-round.
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How an Energy Recovery Ventilator Works
- Stale air in — pulled from the house before it is exhausted
- Core — the two air streams cross without mixing, and heat transfers between them
- Exhaust — stale, spent air is pushed outside
- Fresh air intake — outdoor air is drawn in and pre-tempered by the core
- Supply — fresh, filtered air is delivered back into the house
Modern homes across Cumberland County are built tighter than ever before, which is excellent for energy efficiency but can create indoor air quality challenges. Energy Recovery Ventilators (ERVs) are the solution that Southern Maine homeowners need to enjoy both energy efficiency and fresh, healthy air. An ERV system continuously exchanges stale indoor air with fresh outdoor air while recovering energy from the outgoing air to precondition the incoming air. This means you get fresh, filtered air year-round without sacrificing the efficiency of your heat pump installation. Whether you live in Portland, Gorham, or anywhere in Cumberland County, an ERV system is one of the smartest investments you can make for your family's health and comfort.
ERV systems are particularly important for homes with ductless mini-split heat pumps or other high-efficiency HVAC equipment. When your home is well-insulated and air-sealed, pollutants, moisture, odors, and carbon dioxide can build up without proper ventilation. An ERV addresses this by providing continuous, balanced ventilation that removes these contaminants while recovering up to 80% of the energy from the exhaust air. This is especially critical during Maine winters when opening windows is not practical. From Westbrook to Scarborough, homeowners trust Southern Maine Heat Pumps to design and install ERV systems that work seamlessly with their existing HVAC equipment.
At Southern Maine Heat Pumps, we specialize in integrating ERV systems with your home's heating and cooling infrastructure. Our team has extensive experience installing ERVs in both new construction and retrofit applications across Cumberland County. We work with industry-leading manufacturers to ensure your system is quiet, efficient, and perfectly sized for your home. And with our annual maintenance plans, your ERV will continue delivering fresh, healthy air for years to come. Better indoor air quality is not a luxury—it is a necessity for modern, energy-efficient homes in Southern Maine.
Better Air Quality for Tighter Homes
Energy-efficient homes in Cumberland County are built to be tight and well-sealed, which is excellent for reducing heating and cooling costs. However, this can trap stale air, excess moisture, cooking odors, VOCs, and other indoor pollutants inside your living space.
An ERV system solves this problem by providing continuous, balanced ventilation. It exhausts stale indoor air while bringing in fresh outdoor air, and it does this while recovering energy from the outgoing air to precondition the incoming air. The result is healthier indoor air quality without sacrificing the efficiency of your heating and cooling systems.
Why Tighter Maine Homes Need Mechanical Ventilation
Air sealing and insulation upgrades that make a heat pump perform well also make a house hold onto stale indoor air longer — moisture, odors, and indoor pollutants that used to leak out through drafts now have nowhere to go. An energy or heat recovery ventilator solves that on purpose, bringing in fresh outdoor air without throwing away most of the heating or cooling already paid for.
ERV vs. HRV: The Difference Is Moisture
Both an energy recovery ventilator (ERV) and a heat recovery ventilator (HRV) work the same basic way: two air streams — stale air leaving the house and fresh air entering it — cross paths inside a core without physically mixing, transferring heat between them so the incoming air arrives already partway tempered. The difference is that an ERV's core also transfers some moisture between the two streams, while an HRV's core transfers heat only.
In Maine's climate, that distinction matters seasonally: in winter, an ERV keeps some humidity from escaping with the exhaust air, which helps a dry heating season feel less dry; an HRV instead exhausts that humidity entirely, which some homes with a persistent moisture problem may actually prefer. Which one makes sense depends on the specific house, not a blanket rule.
Sized to the House, Not Just the Square Footage
Ventilation equipment is sized to the home's calculated fresh-air requirement and its duct layout — bedrooms and living spaces typically get supply air, while kitchens and bathrooms are the more common exhaust pickup points. A unit that's undersized for the house won't clear moisture and indoor pollutants fast enough; one that's oversized wastes the fan energy needed to run it and can over-dry a house in the coldest, driest part of winter.
Where It Actually Gets Installed
Most residential units mount in a basement, mechanical room, or conditioned attic space, with dedicated ductwork separate from a home's heating and cooling ducts (some installations tie the fresh-air supply into existing ductwork instead, which is a more involved design decision). Both the fresh-air intake and stale-air exhaust need clear hoods on the exterior, positioned apart from each other so exhaust air isn't immediately pulled back in as intake.
Not Just a Residential Add-On
The same heat-exchange principle scales up to commercial buildings, where energy recovery ventilation is often paired with a VRF system rather than a stand-alone appliance — bringing in code-required fresh air for occupants without undoing the efficiency of the building's heating and cooling system.
Efficiency Maine
Rebates & Guidance
- Rebate
Commercial ERV money is measured by the CFM
Efficiency Maine prices commercial energy recovery ventilator incentives against rated airflow and how efficiently the unit recovers heat: retrofit jobs pay $2.00 per CFM at 65–75% recovery efficiency and $2.50 per CFM once a unit clears 85%, while new-construction projects run $1.50 to $1.75 per CFM.
Source: Efficiency Maine - Recommendation
Rarely a stand-alone line item
Once a building or a home gets sealed and insulated well enough, fresh air stops arriving on its own through drafts — an ERV brings it back in deliberately, without giving away the heating or cooling that was already paid for. Most of the time it gets scoped as part of a broader heat pump project rather than ordered on its own.
Source: Efficiency Maine
Program details as of Sep 26, 2026. Rebate amounts and eligibility change; confirm current terms at efficiencymaine.com.
What We Offer
Every ERV installation is customized to your home, your ventilation needs, and the Southern Maine climate.
Fresh filtered air without energy loss
Balanced ventilation for healthier indoor air
Humidity control in every season
Pairs perfectly with heat pump systems
Reduces allergens, pollutants, and stale air
Meets or exceeds building code ventilation requirements
Our ERV Systems Process
From first call to final walkthrough, here is what you can expect when you choose Southern Maine Heat Pumps.
Air Quality Assessment
We evaluate your home's ventilation needs, air tightness, and existing HVAC setup to determine the right ERV solution.
System Selection
We recommend an ERV unit sized for your home's square footage and occupancy, matched to your heat pump system.
Professional Installation
Our technicians install the ERV with dedicated ductwork, intake and exhaust ports, and controls integrated with your HVAC.
Balancing & Testing
We balance airflow, verify energy recovery performance, and test the system in all operating modes.
Owner Walkthrough
We explain filter maintenance, seasonal settings, and how your ERV works with your heat pump for optimal comfort and efficiency.
Why Choose Southern Maine Heat Pumps
Trusted by homeowners across Gorham, Portland, Scarborough, and beyond.
Healthier indoor air for your family
Recovers up to 80% of heating and cooling energy
Reduces condensation and mold risk
Works year-round in Maine's climate
Lowers overall HVAC operating costs
Quiet, continuous whole-home ventilation
What Our Customers Say
Here's what homeowners across Southern Maine say about the work.
“Nate did a nice, professional job cleaning and servicing our heat pump. We recommend and will use them again.”
Justin Spear
August 2026
“I had neglected annual service out of fear that it would cost a fortune but when I called to make the appointment, they let me know what was included in service and the cost- amazing! I appreciated that they were willing to service the system even though they did not do the installation.”
Ben Winkler
April 2026
“I contacted Southern Maine Heat Pumps to service my two units. The technicians who came out to service our heat pumps did an outstanding job. They were very thorough and helpful. They did a way better job than what I have experienced before with other maintenance services.”
Matt Heer
March 2026
“The technician arrived right on time, diagnosed the issue quickly, and had both of my heat pumps running smoothly in no time. They explained everything clearly and didn’t try to upsell unnecessary services — just honest, quality work. The price was fair, and the customer service was exceptional.”
Sarah McKay
November 2025
“Steve and Nate do an amazing job. I have been using this company for 5 years for heat pump cleaning, highly recommended.”
Sandra McKinney
November 2025
“We have 5 splits and two condensers that needed cleaning. This company responded quickly with a fair price, scheduling was easy with several day/time options, they showed up on time, professional, proficient and completed the project in under 3 hours. Outstanding service/company.”
Ria Romano
June 2025
Explore Our Other Services
Southern Maine Heat Pumps offers a full range of heating and cooling solutions for your home or business.
Ready to Get Started?
Schedule your free in-home consultation today. Our team will assess your ventilation needs, recommend the perfect ERV system, and explain how it will integrate with your existing heating and cooling equipment. Homeowners across Southern Maine trust us for honest advice and expert installation.
Call us directly at (207) 317-1077 or fill out the form to get started.