Average cost of centeral air instalation for 1500sq ft house?

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It depends on the seer rating, brand, model, what you need for electrical size of plenum on furnace and how hard it is to run the line set. $2500.00 give or take $500. 00 sometimes a cheap price is not a good deal. Make sure the person installing the unit purges nitrogen through the unit when soldering up the line set this will keep the system free of contaminates a lot of shops don’t. Make sure that they use a vacuum pump and a micron gauge to pull a vacuum on the unit after install. If the unit is not installed properly, it will work for a few years but then the dirt will take its toll and you will need to replace it long before it is time