WebUnit 9 APES 9.A- Climate Change-Greenhouse effect- a process that occurs when gasses in Earth’s atmosphere trap in the sun’s heat-Greenhouse gasses (GHG) are heat-trapping gasses-This effect is necessary to make the planet habitable-Without GHG, the planet becomes too warm (climate change and global warming)-An Increase in GHG drives … WebGas fired condensing unit heaters are now available with an efficiency of 93%. These remove excess flue gas heat and put it in the greenhouse. They are available in several heat outputs. Condensing boilers and heaters are more expensive than conventional boilers but with fuel prices escalating, the payback period continues to decrease.
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