Most air conditioning units are not the appropriate size for a home, as per US Department of Energy. So, you need an accurate measurement of the area where you will use the air conditioner. In this calculation, other important factors include insulation, windows, siding materials and ducts.
Unlike older models, the latest air conditioning units are high in energy efficiency. They have the ability to cool your place without using much energy. They can considerably reduce your monthly utility bills. Though energy efficient air conditioners are more expensive, they give more significant savings in the long run.
For a higher cooling capacity, choose a unit with the higher BTUs per hour.
Whenever you purchase energy efficient appliances like air conditioners, the government gives tax credits. You can save as much as $500 for every unit that qualifies. In addition to this, you can also get Manufacturer Rebates and Utility Company Rebates.