Swamp cooler motors use 110 volts of electricity, refrigerated air for your central air conditioning conversion will use 220 volts. The electric bill will go up. Very important and useful information for anyone making a decision to convert is the electric bill. Evaporative cooling is on if you are home, refrigerated central cooling will satisfy a thermostat and shut off for a time. The efficiency standards have evolved over the years and the federal government will not allow manufacturers to build models that do not offer high-efficiency, even the lowest “builder model” units must maintain at least 13 SEER. Many consumers fearful of high electric bills have put off the comfort of a nice central air conditioning and heating system long enough. As said above, the bill will go up, just not as much as the average consumer fears. You pay for comfort! You drive a nice car, you watch your cable tv, you dine out when you want…why would you want to avoid being comfortable in your own home for a few bucks more a month? Sure, the swamp cooler works some of the days of summer, but for the most part it does not do a very good job keeping you and your family comfortable.