We know it doesn’t feel like it right now, but we’re quickly approaching the dog days of summer. If last year was a little sweatier than you liked, it might be time to upgrade your air conditioning unit (or just splurge on one for the first time). You're in luck: Now's the time to shop.

Frigidaire’s Smart Window Air Conditioner is $100 off on Amazon right now.

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BUY NOW: Frigidaire Smart Window Air Conditioner, $250, amazon.com

Anyone who has ever lived without the convenience of central air knows that window air conditioning units can be pricey. This particular model typically goes for upwards of $350, but right now you can snag it for $250. Think about all the rosé, pool floats, and general summer fun you can enjoy with that $100 saved.

The unit is compatible with a Frigidaire’s app that lets you control the temperature of your room from anywhere using your smart device. So if you forget to shut it off before you leave for work, you don’t have to worry about a day’s worth of cold air going to waste. It also works with Amazon Alexa, so you can adjust the temperature with your voice.

Air conditioners cost U.S. homeowners nearly $29 billion a year, according to the United States Department of Energy, so this sale is just one way to save. Here’s some more ways to cut costs once you have your A/C unit in your house.

1. Don't just set it and forget it.

If you have central air controlled by a thermostat, use a programmable thermostat to save energy by turning the desired temperature up during the day when the house is empty. You can give up a couple degrees at night, too — especially on the hottest days. When home, aim to set the temperature at 78 degrees to balance comfort with energy and cost savings.

2. Clean the air filter.

Whether you have central air or a window unit, a dirty filter will reduce your A/C's efficiency, making it use more energy. Check your HVAC system's air filter monthly and expect to change the filter every three months.

3. Get an annual checkup.

If you have central air, bring in a pro to check it out — once per year should cover both the heating and the cooling season. A professional should be able to diagnose any inefficiencies before you've wasted money on monthly heating and cooling bills.

4. Think small.

Cooling one room with a window air conditioning unit requires much less energy (and investment) than a whole central air system for your house. Ask yourself how you'll use your new air conditioner, and choose the smallest option that works.

5. Buy Energy Star.

Whether you're buying a central air conditioner (which could qualify for a tax credit) or a room unit, efficiency matters. An Energy Star central air system will use about 14% less energy than minimum government standards, and a room air conditioner will save at least 10%.