This is due to the development of condensation within the ducts leading to mold growth.
Attic swamp cooler.
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They knock the edge off the heat but can t get ice cold when its really hot out.
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With attic vents unblocked and open normal circulation allows the air to pass to the outside.
Most people open a window.
You have to winterize them as they pump water over a membrane.
Evaporative coolers need to have an exit to the outside to work properly and efficiently.
Swamp cooler a good one will set you back 3500 to install.
If you choose not to remove the ductwork you could install a large attic fan in the roof void.
Evaporative coolers are most effective in areas of low humidity and hot temperatures.
Evaporative coolers also called swamp coolers combine the natural cooling properties of water with a steady breeze to lower indoor temperatures this guide will help you determine which type is best suited for your needs.
Universal rigid media for 6400 cfm evaporative coolers 110133 2.
This is an inexpensive and easily accomplished task.
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This lets you keep the windows closed and still provide a pathway to the outside.
The 15 to 40 f cooler air is then directed into the home and pushes warmer air out through windows.
The third graph shows attic temperatures from the middle of the attic for several different types of roofing as well as a sealed attic.
In this case the most reflective roofing material ivory ir selective metal tile is 23 4 f cooler than attic covered with dark shingles.
When force fed into the attic by evaporative cooler air pressure the air passes to outside in.
Avoid the cheapie home depot units.