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A malfunctioning and inefficient air conditioner has to work twice as hard (or more) to maintain your indoor climate, using much more energy. So if you notice an unexplained increase in your energy bill, call your HVAC professional and schedule an AC replacement.
When you turn on your AC, cool air should come from the vents. If all you're getting is hot air, it's a clear sign that you need an upgrade.
If your AC keeps breaking down despite regular maintenance, you might want to start looking for a replacement. Instead of spending your hard-earned money repairing your malfunctioning unit every few months, consider spending that money getting an upgraded unit that will provide you with reliable heating and cooling and save you tons of money in repairs.