BTU Meter

At Gravina’s, being environmentally and economically friendly is important to us as much as it is to our customers. We take pride in providing our customers with window replacement options that will prove efficient in times of rising energy prices and changing environmental regulations. But how do we measure a window’s ability to block solar energy, keeping the heat out of your home without keeping the light out as well?

Our professionals at Gravina’s use a British Thermal Unit (BTU) meter to measure thermal heat, or the amount of solar energy passing through windows or glass. One BTU is the amount of energy needed to heat one pound of water 1°F.

With a BTU meter and a heat lamp, we are able to demonstrate the benefit of adding low-emissivity, or low-e, glass coatings to windows. Low-e glass and coatings decrease the amount of UV/infrared light, which can bring more heat into your home and cause furniture and fabric to fade. However, low-e glass does NOT limit the amount of light that comes through.

With low-e glass, when the heat from inside your home tries to escape to the cooler air outside during our cold Denver winters, the glass reflects the heat back inside. During the warmer months, low-e glass prevents the outside heat from making its way into your home. This makes low-e glass incredibly energy efficient and budget-friendly.