The whole house is much more comfortable. The temperature throughout the house is much more even. I appreciate your personal attention, flexibility and the work ethic of your crew.
— Chip from Keene, NH

Welcome to Farnum Insulators


Awarded "Most Thermal Savings" and "Most Projects" for a small company in 2016 by Efficiency Vermont's Efficiency Excellence Network

New England’s weather requires buildings to have a higher standard for insulation than many other parts of the country. With decades of building and contracting experience, we saw firsthand how poorly fiberglass insulation performs — leading to lost money, less comfort and wasted energy resources.

We work with homeowners, businesses, and institutions to:

  • Assess your building’s insulation needs through thorough diagnostic testing

  • Create the most cost-effective and non-invasive plan to increase your energy efficiency

  • Find all available cost saving incentives and grants to reduce your costs

  • Help you enjoy your home or place of business more than you ever have

Building Performance Institute certified and focused exclusively on insulating homes and businesses, we are the most trusted name in insulation. Contact us today to start saving money.

cellulose insulation technicians

cellulose insulation

Cellulose is a great insulation material with a high R-value. It’s treated against fire, mold and pests as well as being made from recycled material. We can work in new or existing structures and we’ll help you choose the most cost-effective and non-invasive methods to meet your insulation needs.

spray foam insulation technician.jpg

foam insulation

Sometimes cellulose isn’t the best option. Damp basements, rim boards and some wall cavities are best insulated using this amazing spray-on foam. With high R-value, an ability to expand into a space and airtightness, we’ll advise you on which insulation is best for you.

In the news

indow® interior window inserts

We are a certified Indow® Window dealer. These are interior windows that are nearly invisible, require no hardware, do not damage the window frames or trim, and double your windows’ energy efficiency. Indow® window inserts give you energy-saving insulation equivalent to double-pane windows, and they're even better at insulating sound. Plus, you don't have to worry about any lead contamination that can occur when your old windows are ripped out of the walls.

indow interior window inserts energy efficient

diagnostic testing blower door infrared camera

diagnostic testing

We have the tools and expertise to identify problems in your home or building. We use a blower door test and infrared camera to find where you’re losing your energy dollars. During the inspection, we also check for moisture and basic structural integrity to make the best choices for you and your building’s overall health.

energy and building efficiency Affiliations

Sustainable Energy Outreach Network

Civic and Business Affiliations


Farnum Insulators is tied to our neighborhood and caring for our community is important to us. We support a variety of important organizations including the following: