We can give you a quick answer, because it's no contest: fans. Whether you're talking about using just the blower fan of your HVAC system (“fan only mode”) or ceiling fans, these devices use only a small fraction of the amount of energy of turning on the air conditioner.
Cooling yourself with a fan vs. an air conditioner is significantly more energy efficient and cheaper. Fans use around 1% of the electricity consumed by air conditioners. You could leave a fan running for 24 hours and still use less energy than 15 minutes of air conditioning.
Thanks to the cooling properties of ceiling fans, you can help to reduce your monthly energy costs. Most central air conditioning systems cost around 43 cents per hour when they're on, which can really add up over time. On the other hand, a ceiling fan typically costs a paltry one penny to run per hour.
If u run a split AC for one hour, it would use approx 3.75 units. This is the equivalent of running 12 ceiling fans for an hour.
Interestingly, Dr. Fielder considers sleeping with a fan much safer than sleeping by an air conditioner. It is all about what air is being circulated and where it is coming from.
It can cause coughing fits in the night
Similarly, this irritation can cause excess coughing. As we've mentioned, running a fan all night long dries out the air in your room. Breathing in this dry air can irritate your throat and lungs, causing you to wake up coughing throughout the night.
Ceiling Fans Are a Healthier Option
This is not a problem with fans – they simply circulate the air around the room – eventually moving it out through open doors and windows. Fresh, healthy air is thus enabled to move freely through your home.
When the California summer heat rolls in, pairing your AC with a ceiling fan is your best defense. By correctly setting the fan's direction, adjusting the thermostat, and a few other simple strategies, you can keep your home cool without driving up your energy bill.
If you have a 5 ton A/C running 9000 watts then 180 50 watt fans might use the same power. But the cooling just won't be anywhere near the same.
leaving it on all day and night is better for the HVAC system because it's less taxing. Should you turn off your AC when on vacation? HVAC experts agree it's better to keep your AC on when you're on vacation, especially if you don't plan to leave any windows open.
Using your ceiling fans and AC unit simultaneously can help save you money on your monthly cooling bill. According to the Department of Energy, if you use air conditioning to cool your home, a ceiling fan will allow you to raise the thermostat setting about 4°F with no reduction in comfort.
"Most electrical fans are designed to be able to run continuously for several hours at a time, for example overnight or during the day, but you'll also need to keep in mind doing that continuously for long periods can cause wear and tear on the motor and other components, shortening its lifespan," continues David.
Some people make the mistake of assuming they'll save money by running the fan without the AC when it's warm out. While it is true that the fan alone uses less energy than the AC, leaving it on will almost certainly result in higher utility bills.
Heating and cooling: 45-50%
The largest electricity consumer in the average household is your heating and cooling appliance. By a long shot. Central air conditioners and heaters use tons of energy in order to keep your home set to the right temperature.
Running a fan for the entire day will use some electricity, but it's far less than an air conditioning unit running for the same amount of time. Even if you run the fan for 24-hour periods, this would likely account for less than one dollar per day on your electricity bill.
Use fans to help the AC
Fans are cheaper to run than air conditioners, and can be used in place of air conditioners or along with them to save money.
It only makes you FEEL cooler because it's moving air over your skin, carrying the heat away from your body. This is the wind chill factor you hear on the Weather Channel so often. So it's doing nothing to lower the temperature in your home, meaning your A/C will run just as long whether the fan is on or not.
The cost of air conditioning
As a result, parking yourself in front of a fan is significantly more energy efficient. Fans use around 1% of the electricity consumed by air conditioners. You could leave a fan running for a full 24 hours and still use less energy than 15 minutes of air conditioning.
Your air conditioning system is one of the biggest culprits behind skyrocketing electric bills. When your air filter is dirty, refrigerant levels are low, your thermostat is faulty or you lack proper maintenance, your A/C system can end up using a lot more energy than it should.
Cons to Keeping Fan Continuously Running:
It could cost you hundreds of dollars a year. The average unit has a 500 watt fan, which uses almost as much energy over the course of the year as a refrigerator, resulting in a $50/month bill.
A ceiling fan uses around 65 watts of electricity per hour – around 20 times less than a split system air conditioner and up to 100 times less than ducted air con. In terms of running costs, you should expect to pay around: 2 cents per hour for a ceiling fan. 33–40 cents per hour for a split system air conditioner.
Here's what to consider: Climate and Weather: In regions with warmer climates or on cooler summer evenings, a fan might be all you need to stay comfortable. However, an AC is better when dealing with extreme heat or high humidity.
Before going to sleep, the air conditioning temperature must be regulated so that it varies between 24ºC - 26ºC in summer and between 15ºC - 17ºC in winter. The environment will be suitable, without exposing your body to sudden changes that may adversely affect it.
A typical ceiling fan consumes about 60 watts per hour on an average. An average 1-ton split AC consumes around 1,200 watts per hour (1.2 kWh). Power consumed = 60 watts per hour × 8 hours = 480 watts (0.48 kWh) per day. If the cost of electricity is ₹8 per kWh, the daily cost would be 0.48 kWh × ₹7 = ₹3.84 per day.