A few select tips to help you decide direction when buying heating and air conditioning equipment. HOW LONG DO I PLAN TO LIVE OR OWN THIS HOUSE? This should be the first question you ask yourself. If in the next five years you are going to sell the house or turn it into rental property, you should consider spending a lessor amount. If you are going to keep the house for 10 years or more, you should look at higher efficiency systems. Why? Because by then you will more than ta