Modern sliding glass doors are engineered to cut heating and cooling costs, and ENERGY STAR certified units can reduce energy bills by an average of up to 13% nationwide. With 7,000+ installations completed since 2011, Coastal Windows & Exteriors is a woman-owned exterior remodeling company serving 730+ towns across Massachusetts, New Hampshire and Maine, installing ENERGY STAR-certified sliding glass doors engineered for tight seals and lower energy bills.
What Homeowners Need to Know
- ENERGY STAR certification matters: Installing ENERGY STAR certified windows, doors, and skylights can reduce heating and cooling costs by an average of up to 13% nationwide compared to non-certified products. That’s real savings for any home that runs the furnace hard from October through April.
- Durability is the top industry priority: According to a 2026 Fixr survey, durability and longevity is the most important factor when selecting doors — rated important or very important by 100% of windows and doors contractors and industry specialists surveyed.
- Thermal performance ranks close behind: Thermal performance (U-factor/R-value) is a priority for 87% of windows and doors professionals. Double-pane glass with low-e coatings is the current standard for doors in cold-weather climates.
- Warranty and after-sales service follow: Warranty and after-sales service was cited by 92% of surveyed windows and doors professionals as important or very important. Ask any door company what their post-installation support looks like before you sign.
- Aesthetics rank third: Aesthetics are important or very important to 91% of contractors and specialists surveyed. Sliding glass doors let in natural light while keeping the elements firmly out.
- Local energy bills are no joke: Local households spend roughly $600 per month on energy bills. Energy efficient doors that reduce air leakage are one of the most practical upgrades a homeowner can make.
Request a free sliding glass door estimate from Coastal Windows & Exteriors.
Browse our complete door FAQ guide from Coastal Windows & Exteriors.
Explore the Coastal Windows & Exteriors Door Exterior Remodeling Home Improvement Help Center.
Still have questions about how energy efficient are modern sliding glass doors? See the areas we serve and talk to your local door contractor.
Last Updated: August 2026
Sources:
- Installing ENERGY STAR certified windows, doors, and skylights can shrink energy bills by an average of up to 13% on heating and cooling costs nationwide, compared to non-certified products. ENERGY STAR – Residential Windows, Doors & Skylights ENERGY STAR’s official resource on certified products and estimated energy savings. (No date – Accessed August 2026)
- According to a 2026 Fixr survey, durability and longevity is the top priority for doors, rated important or very important by 100% of respondents. Fixr – Windows and Doors Report Fixr’s survey data on contractor and specialist priorities in window and door selection. (2026)
- Massachusetts households spend roughly $600 per month on energy bills. Boston.com – Massachusetts Utilities Report Boston.com reporting on average monthly utility costs for Massachusetts homeowners. (2024)
