What is the lowest AC should go?

In short, the 20-degree rule of air conditioning states that you should always keep your AC unit at no more than 20 degrees lower than the outside temperature. It means that, if the outdoor conditions are at 95 degrees, you should set your thermostat at no less than 75 degrees.

What is the lowest temp I can run my AC?

In most cases, especially in residential applications, you should not run your air conditioner when outdoor temperatures are below 60 degrees. The air conditioner does function, but you are going to burn out the compressor fairly quickly.

Is 72 too low for AC?

It's best to not set your thermostat lower than 70 to 72 degrees. Most units are not designed to cool a house below that point, and you risk the system freezing up.

Is 68 too low for AC?

The refrigerant no longer absorbs as much heat and the temperature in the coil drops, causing the evaporator coil to freeze and making the system inoperable until it defrosts. Thus, temperature setting below 68 degrees is generally not recommended for optimal performance.

Is 75 too low for AC?

Generally, when you are at home, your A/C's ideal temperature is between 76- and 78-degrees Fahrenheit. If you spend most of the day away from the house, set the thermostat a few degrees higher instead of cooling your home for no reason.

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Is it bad to set your AC to 65?

Generally, most AC units will do well with a thermostat set somewhere between 65 and 80 degrees.

Is 78 too cold for AC?

According to Energy Star, it's an ideal temperature. 78 degrees keeps you fairly cool and comfortable during the day. It also shouldn't make your electric bill skyrocket. Start with your thermostat at 78.

Is 70 too hot for AC?

If you want to feel good, as in comfortable, many people will want to lower their thermostat to the low 70s in summer. But if you're talking about saving money on energy and limiting your environmental impact, 70 degrees Fahrenheit is a very bad temperature for your AC to reach.

Is it bad to run AC below 70?

Do not set your thermostat below 70 degrees as it will not cool any faster and could freeze up the system causing more problems. Understand that there is generally a 20 degree difference between indoor air and outside temperatures.

How cool should my house be if it's 100 outside?

How cool should my house be if it's 100° outside? The majority of air conditioning units are designed to only cool the air about 20 degrees from the outside temperature. If the temperatures outside are approaching triple digits, you should set your thermostat at about 78°.

What should I set my AC to in summer?

While you ultimately must decide what temperature you feel comfortable at, the US Department of Energy and Energy Star suggest that the best AC temperature is 78°F for summer days.

What should I set my AC to at night?

Sleeping in a room with the air conditioner set to an appropriate temperature is important for quality sleep. The ideal AC temperature for sleeping is around 65°F (18.3°C). However, this may differ between individuals, who might find their ideal AC temperature lies between 60 and 67°F (15.6 and 19.4°C).

Does it cost more to keep your thermostat below 72?

Compared to 70-72 degrees, thermostats set to 68 degrees will save money. The National Renewable Energy Laboratory performed a study that showed that people prefer a winter thermostat setting of 67-70 degrees.

Is 69 too low for AC?

Turning your AC to 69 degrees is getting relatively close to the “danger zone” for causing it to freeze up and break. Typically, we recommend keeping your thermostat set to no less than 68 degrees. Since 69 is above that temperature, it would most likely be safe.

Is 76 too cold for AC?

Typically, our bodies are most comfortable when the air inside our home is 74-76 degrees. So, a safe setting is 75 degrees. However, this is only necessary when you're in your home.

Will AC freeze up if set too low?

Does setting a thermostat too low cause an air conditioning system set in cool mode to freeze? The answer is no, at least not directly. However, low evaporator load (low return temperature or low airflow) and low outdoor ambient temperature can lead to evaporator coil freezing.

Does setting AC too low damage it?

If you lower the thermostat so it's set more than 20° lower than the current outside temperature, the AC won't be able to reach its target temperature. Instead, it will run and run, wasting larger amounts of energy and wearing down, possibly leading to it overheating and shutting down.

What should AC be set at?

According to the Department of Energy¹, 78° Fahrenheit is the sweet spot for air conditioners to balance energy savings and comfort when people are at home and need cooling.

Is 72 a AC hot or cold?

When setting your thermostat, most homeowners find 72 is a good temperature for air conditioning. However, you may need to adjust that setting based on weather conditions. The bigger the difference between indoor and outdoor temperatures, the higher your energy bill will be.

Why is my house too hot even with AC?

Air leaks and poor insulation are a common cause for making your house feel hot, even when the AC is working, as they can allow the air your air conditioner has worked so hard to cool to escape, leaving your house hot. Humidity can interfere with your thermostat's ability to track temperatures and also traps heat.

Why does my house feel hot at 73?

Check for dust, dirt, and other kinds of residue inside the thermostat. Excessive dust and dirt buildup can prevent your thermostat from working properly. Clean any residue you see on the thermostat, and see if that helps improve the temperature in your home.

How low should I set my AC in summer?

It turns out that the best indoor temperature for your home during the summer months is 78 degrees, according to the U.S. Department of Energy. If that temperature falls outside your comfort level, there are several ways to modify how your home feels without causing your energy bill to spike.

Should you lower AC at night?

If the nighttime air that comes into your home cools the indoor temperature to lower than you usually set the thermostat for the air conditioner, turning off the AC should save you some money.

Is it cheaper to keep AC at constant temp?

The startup process for a furnace consumes more energy than simply running the entire time at one set temperature, costing you additional money. To maximize efficiency, it's best to keep your furnace (or AC) at the same consistent temperature for long periods of time.

Is 68 too cold for AC in summer?

According to the DOE, the ideal home temperature during winter weather is 68 degrees Fahrenheit. In comparison, the ideal air conditioner temperature during the summer months is 78 degrees Fahrenheit.