That is why energy efficient AC units may be required to provide a comfortable environment year-round. Products with the Energy Star label are designed to be more energy efficient then standard industry units. It should be noted that the attic fan and AC units should NOT be utilized at the same time. The air cooled by the AC units would be pulled out of the house by the fan. Due to the high humidity levels in Central Texas during the summer, the evaporative AC unit would not be effective.
Evaporative coolers require low humidity levels because they cool the air by humidifying it.
If the air already has a high level of humidity, the evaporative cooling process will not occur. The multi-function AC unit may be desirable when both cooling and dehumidifying are required. This is the amount you spend just to heat your water. This may seem like a small price to pay for the convenience of a hot shower, but during the course of a year, the cost adds up. There are several ways to decrease water-heating costs.