A cheap fix here would be wrapping them with electrical tape.
Using a warmth pump may save on power cost in your home. Some cars simply blow uncooled air through the perforations to achieve an air conditioning impact. How To Thoroughly Clean Air Conditioner Coils
In fact, most evaporative air coolers are able to awesome up to 350 square feet.
This is the equivalent to the temperature change of stepping out of a heat house into a snow storm. Look for cracks, worn out components and looseness.