Show more. If your AC isn’t working, it may be worth it to check out the AC evaporator coil. Replacement costs for this accessory vary between $550 and $2,500, with the average homeowner By Leon Kloostra. Figure 1. Sweating is perceived as a problem with diffusers but is an indicator of a larger problem with the HVAC system. Figure 2. Installing an insulation blanket on the backside of the diffuser will help prevent sweating. Figure 3. Sweating may be dangerous and should be diagnosed and treated to avoid costly renovations. The condenser uses moving air to cool the system’s refrigerant. When driving the vehicle at higher speeds, this takes care of itself, but the condenser needs a fan to function at lower speeds. If the fan stops working, you’ll notice a difference in how well the A/C system cools the cabin while driving around town versus on the highway. If your AC is too small, the HVAC repair person will offer recommendations to install a larger unit or possibly install a mini-split AC unit in addition to your current AC. 2. The Air Filter Needs The most commonly used AC refrigerants are Hydrochlorofluorocarbons (HCFCs) i.e. Freon (R 22) and R 402A for domestic and commercial air conditioning systems. Nowadays, Hydro Fluro Carbons (HFC’s) i.e. R-32 and R-410A, are used in most of the systems. Possible health risks fKAFvo.

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