At Kasson & Keller, we are committed to manufacturing high-quality, energy-efficient vinyl windows for homes across the Northeast.
This page explains:
At Kasson & Keller, we are committed to manufacturing high-quality, energy-efficient vinyl windows for homes across the Northeast.
This page explains:
ENERGY STAR® is a program backed by the U.S. Environmental Protection Agency (EPA). It sets performance standards to help homeowners choose energy-efficient products.
All Kasson & Keller residential windows are ENERGY STAR® certified when configured to meet regional performance requirements.
ENERGY STAR certification means your windows are designed to:
Reduce heat loss in winter
Reduce heat gain in summer
Improve indoor comfort
Help lower energy bills
ENERGY STAR® Most Efficient is a higher performance tier within the ENERGY STAR program.
To qualify as “Most Efficient” in 2025, residential windows must meet enhanced performance thresholds. For example, in the Northern climate zone, windows must have a U-factor of 0.20 or lower.
These performance levels exceed standard ENERGY STAR requirements.

Beginning in 2025, the IRS requires that homeowners report a Qualified Manufacturer Identification Number (QMID code) when claiming the Energy Efficient Home Improvement Credit for eligible products.
For exterior windows and skylights, the IRS requires that the product:
Meet ENERGY STAR® Most Efficient certification requirements
Be produced by a qualified manufacturer
Include a QMID code reported on the homeowner’s tax return
Without a qualifying product and associated QMID code, the tax credit cannot be claimed for that item.
Click Here to learn about the IRS Energy Efficient Home Improvement Credit
In 2025, Kasson & Keller did not manufacture residential window products that met the ENERGY STAR® Most Efficient criteria required for QMID code eligibility.
While our residential windows are ENERGY STAR® certified, they did not meet the enhanced “Most Efficient” threshold required for the 2025 federal tax credit.
If you would like to review the performance values for your specific order, please provide your order number.
We will gladly confirm:
Your window’s certified U-factor
ENERGY STAR certification status
Applicable performance ratings
Please contact us at:
📞 518-853-3421
📧 customerservice@kassonkeller.com
ENERGY STAR requirements and federal tax programs may change from year to year.
We continuously monitor evolving standards and remain committed to delivering high-quality, energy-efficient products for our customers.
If future products meet enhanced ENERGY STAR Most Efficient standards, updated information will be provided here.