Thermal Aluminum Windows Thermal barrier aluminum frames are heat strengthened by bringing the raw aluminum up to a T5 temper to increase both strength and rigidity. Greatly reducing the amount of heat or cold transferred through the frames. Thermal aluminum windows from J&M Glass surpass strict industry specifications. Air leakage with a 25 MPH wind blowing outside cannot exceed 0.375 cubic feet per minute (CFM) for every foot of weather-stripped window perimeter. Our 700 Series Double Hung allows only 0.06 CFM air infiltration – one sixth of the industry standard!Thermal aluminum windows from J&M Glass surpass strict industry specifications. Air leakage with a 25 MPH wind blowing outside cannot exceed 0.375 cubic feet per minute (CFM) for every foot of weather-stripped window perimeter. Our 700 Series Double Hung allows only 0.06 CFM air infiltration – one sixth of the industry standard! Thermal Aluminum Windows has lower air leakage and higher resistance to heat transfer than non thermal break windows. With double glazing, they will stop 26% to 38% of the heat lost through comparable wood windows made at local mill work shops. With double glazing, they will stop 26% to 38% of the heat lost through comparable wood windows made at local mill work shops. Our installation department is one of the most experienced and knowledgeable in the industry, fully trained to expertly install our window systems into almost any opening. We control the design, manufacturing, sales, and installation of your windows and back up our work with one of the strongest limited lifetime warranties in our industry!Our installation department is one of the most experienced and knowledgeable in the industry, fully trained to expertly install our window systems into almost any opening. We control the design, manufacturing, sales, and installation of your windows and back up our work with one of the strongest limited lifetime warranties in our industry! Dallas Showroom & Manufacturing Plant, J & M Glass Company, Inc., 8808 Empress Row, Dallas TX 75247 Call Us: (214) 630-5885 Please Visit Us: https://www.thermalwindowsdfw.com/