My best friend is about the most frugal person I know. She is one of the coupon finatics that won’t pay full price for anything. For this reason, when it came time to replace part of her central air conditioning system she started searching for the best deal she could find. This idea works in most cases, but, cutting corners when it comes to something as important as your HVAC system can end up costing you more in the long run. This is exactly what happened. She found someone selling a “scratch and dent” heat pump. This is the exterior unit for her system. It was a different brand from the indoor air handler she had, but she said that they could make it work. Making it work, and making sure it is efficient, are two entirely different things. Yes, the technician could connect the two pieces together, and yes, it would cool her house, but it ended up costing her on her energy bills. When she called the HVAC dealer they told her that the two units were not designed to work together. This affected the air flow and caused the increase in her energy bills. The dealer told her that this was the reason he always recommended replacing both units at the same time. Making sure that the two components were designed to work together was important to ensure the performance that you wanted. She learned a very valuable lesson from this whole ordeal. It isn’t always about the initial cost and sometimes, spending the extra money upfront, can save you significantly in the long run.