You may find that a stable 72F is as comfortable as a 70F air temp in a house that heat-soaked at 74F all day. There are several things you can do to keep your AC unit in the best condition possible for many years of use. The older a unit gets, the less efficiently it works. Air conditioners don’t last forever. It is safe to leave an air conditioner on all day. If you let the house get too warm during the day the walls / floors/ ceilings are all still radiating some heat at you even when the air temp has hit the setpoint, and doesn't stabilize for a few hours. Favorite Answer. If your system runs non-stop and doesn’t keep you comfortable anymore, it could just be an old unit that needs replacing. Opinions vary on the efficiency of closing vents and doors to unused rooms. Mistake No. In most cases, air conditioners are designed to be on all the time. Luckily, there’s a simple solution to all of your AC woes and it’s as simple as purchasing a programmable thermostat . Air conditioners are made to run day and night like refrigerators. The truth: Absolutely false. 9 years ago. Relevance. If the house is going to be empty for most of the day, turn the thermostat up before you leave in the morning and turn it down again when you get home. To get the best energy savings, leave your thermostat set … Portable air conditioners pull the air in from the room, remove the moisture while cooling the air, and send most of the air back into the room. That’s the second law of thermodynamics. ACEEE estimates that air conditioners use three to five percent less energy for every degree you raise the thermostat. It may seem easy to just let your air conditioner run full blast all day long, but doing so wastes a fair amount of electricity. Things to check for: An air conditioner that’s over 12 years old; A system that requires frequent repairs That moisture collects on the system’s coils. Most modern air conditioners turn on and off at intervals throughout the day depending on the outside temperature. The lifecycle of a portable air conditioning unit depends on how well it is set up and taken care of. 6 Answers. In many cases, this can decrease the efficiency of a central air conditioning … jean ann j. Lv 7. The myth: Leaving your air conditioner on all day will help save money in the long run by not having to kick start it each and every time you turn it back on. Air conditioners suck water out of the air like a straw. The ACS we have say not to use extension cords. While it’s not advisable to leave your air conditioner on all day if you’re, say, at work from nine to five, no one wants to come home to a hot house either. This is cheaper and more efficient than leaving the air conditioner running all day, despite rumors to the contrary. Answer Save. Let It Run All Day? 6: Blindly Closing Unused Vents. The reality is, running all day is going to cost you more because it’s going to constantly be cooling your home as the outside saps the cold from inside over time. The more you use a unit, the greater care and maintenance it … When the fan is on “AUTO,” the break in the air stream allows the coils inside of your air conditioner time for the condensation to drip off into the drain pan. Here at Howard Air, we have some tips to help you decide the best way to use your air conditioner efficiently. The extension cord is what you should keep from getting too hot. Is it safe to leave my air conditioner on all day everyday? How Air Conditioners …