How Air King Window and Portable Air Conditioners Work

What Air King air conditioners do and how they fit in your home

Air King makes window-mounted and portable air conditioning units designed for single rooms or small spaces. They're not central air systems—they cool one area at a time, which makes them useful if you want to cool a bedroom without running air conditioning throughout your whole house, or if your home doesn't have built-in AC. Window units sit in a window frame and vent hot air outside. Portable units sit on the floor, pull in room air, cool it, and send the hot exhaust out through a window kit or vent hose.

The reason to choose Air King over other brands usually comes down to price and availability. Air King units are sold at hardware stores and online retailers, and they tend to cost less than premium brands. They work the same way any air conditioner works—a compressor circulates refrigerant through coils to absorb heat from your room and release it outside—but with fewer extra features and a simpler build.

Key Takeaways

• Air King window units mount directly into a window frame and need a power outlet nearby; portable models sit on the floor and need a window kit to vent hot air outside.
• Both types cool a single room, not your whole house, and work best when doors to other rooms stay closed.
• Cooling capacity is measured in BTU (British Thermal Units)—a larger room needs a higher BTU rating, and undersizing means the unit runs constantly without reaching your target temperature.
• Regular filter cleaning every two weeks during cooling season keeps the unit running efficiently and prevents ice buildup on the indoor coils.
• Window units can be stored indoors during winter; portable units take up floor space year-round but move between rooms if needed.

Window units versus portable models: which setup works for your space

Air King window units mount into a double-hung or sliding window and sit half inside, half outside your room. The outdoor half releases the heat your air conditioner pulls from inside. Window units need a power outlet within a few feet of the window, and they block the window view and light. Once installed, they stay put—you don't move them between rooms. They're quieter than portable models because the compressor sits outside, and they use less electricity for the same cooling power.

Portable Air King units stand on wheels or feet and sit inside your room. They pull in room air through vents on the back or sides, cool it, and push it back into the room through a front vent. The hot air and moisture have to go somewhere, so a hose (usually 5 to 8 inches in diameter) runs from the unit to a window, sliding door, or wall vent. Portable units take up floor space—typically 18 to 24 inches wide and 30 to 36 inches tall—but you can roll them to a different room if you need cooling in multiple places at different times. They're louder than window units because the compressor runs inside your room.

Choose a window unit if you have a permanent spot where you want cooling and don't mind losing window access. Choose a portable unit if you want to move cooling between rooms, or if your windows don't open or are rented and you can't install a permanent unit.

Matching BTU to your room size so the unit actually cools

BTU (British Thermal Units) measures how much heat an air conditioner can remove from a room in one hour. A unit that's too small will run constantly and never reach your target temperature. A unit that's too large will cool the room quickly but cycle on and off, which wastes energy and doesn't remove humidity well. Air King publishes BTU ratings for each model, and you need to match that rating to your room.

A rough guide: 5,000 to 6,000 BTU cools a room up to 150 square feet. 7,000 to 8,000 BTU cools 150 to 250 square feet. 10,000 to 12,000 BTU cools 250 to 400 square feet. 14,000 to 15,000 BTU cools 400 to 550 square feet. Measure your room length and width, multiply them to get square feet, then find the Air King model in that range. If your room gets direct sunlight most of the day, or if you live somewhere very hot, add 10 percent to the square footage before you pick a model. If your room is in a basement or shaded area, you can go down one size.

Check the model number on Air King's website or the product manual to confirm the BTU rating before you buy. Undersizing costs you comfort and money; oversizing costs you money and humidity control.

Installation and venting: getting hot air out of your room

Window unit installation takes 30 to 60 minutes. Open your window fully, set the unit's indoor chassis on the windowsill, and slide the window down to hold it in place. Most Air King window units come with side panels that fill the gap between the unit and the window frame—these keep outside air from leaking back in. Secure the unit with the mounting brackets or screws that come in the box. Plug it into a standard outlet. Do not use an extension cord; plug directly into the wall outlet to avoid overheating the cord.

Portable unit setup is simpler but requires a window kit. The kit is usually a flat panel that fits into a window or sliding door frame, with a hole for the exhaust hose. Slide the hose onto the outlet on the back of the unit, then feed the other end through the window kit hole. Seal any gaps around the hose with the foam tape or weatherstripping included in the kit—air leaks reduce cooling efficiency. Plug the unit into a nearby outlet. Some portable models also have a small water collection tank that needs to be emptied every few days during humid weather; check your manual to see if yours does.

Never vent an Air King portable unit into your attic, crawlspace, or another room. The hose carries hot, humid air that will damage insulation and create moisture problems. Vent it outside only.

Cleaning filters and coils to keep cooling steady

Air King units have a filter that traps dust, pet hair, and debris before air passes over the cooling coils. A clogged filter makes the unit work harder, reduces cooling power, and can cause ice to form on the coils. Check the filter every two weeks during cooling season. If it looks gray or dusty, clean or replace it.

Most Air King window units have a washable filter. Slide it out, rinse it under cool running water, and let it dry completely before sliding it back in. Some portable models use disposable filters—check your manual to see which type yours has. If it's disposable and you use the unit daily, replace it every month. If it's washable, rinse it every two weeks.

The cooling coils inside the unit also collect dust and mold over time. If you notice the unit is not cooling as well as it used to, or if you smell a musty odor, the coils need cleaning. For window units, you can spray the coils with a commercial AC coil cleaner (available at hardware stores) following the product instructions. For portable units, the coils are harder to reach—refer to your manual for the cleaning procedure, or contact an HVAC technician if you're not comfortable doing it yourself.

Noise levels and where to place your unit for comfort

Air King window units typically run at 70 to 75 decibels—about as loud as a vacuum cleaner or a busy street. Portable units run at 75 to 80 decibels because the compressor is inside your room. Neither is silent, but both are quieter than older air conditioners. If noise bothers you, a window unit is the better choice because the loudest part (the compressor) sits outside.

For portable units, placement matters. Put the unit as far from your bed or seating area as the hose will reach. If the hose is 6 feet long, place the unit at the opposite end of the room. Close doors to other rooms so the cooled air stays where you need it. The unit will be louder at night when background noise is lower, so expect to notice it more when you're trying to sleep.

Air King units have a fan speed setting—low, medium, or high. Running on low speed reduces noise and uses less electricity, but cooling takes longer. Run on low at night if noise is an issue, and switch to medium or high during the day when you need faster cooling.

Storing your unit and preparing it for winter

Window units should be removed and stored indoors before winter. The outdoor half of the unit can rust or crack if exposed to freezing temperatures and ice. To remove a window unit, unplug it, undo the mounting brackets, and carefully lift it out of the window frame. Drain any water that collected in the pan at the bottom. Wrap the unit in a plastic bag or cover to keep dust off, and store it in a dry place like a basement, garage, or closet. Store it upright, not on its side.

Portable units can stay in place year-round if you're not using them, but they take up floor space. If you want to store a portable unit, drain the water collection tank, unplug it, and cover it with a plastic bag. Store it in a cool, dry place. Do not store it outside or in a damp basement, where the compressor and electrical parts can corrode.

Before you use your Air King unit again next season, clean the filter, check the hose for cracks or holes, and run it on low speed for 10 minutes to make sure it starts and cools properly.

Frequently Asked Questions

Can I use an Air King air conditioner in a room with no windows?

No. Both window and portable units need to vent hot air outside. A window unit vents through the window. A portable unit vents through a window kit, sliding door, or wall vent. Without an outside opening, the unit cannot release the heat it removes from your room, and it will not cool.

Will an Air King unit cool my whole apartment or house?

No. Air King units cool one room at a time. If you close the door to the room being cooled, the unit works efficiently. If you open doors to other rooms, the cooled air spreads out and the unit has to work much harder to reach your target temperature. For whole-home cooling, you need a central air system.

How much does it cost to run an Air King air conditioner?

Cost depends on the BTU rating, how many hours per day you run it, and your local electricity rate. A 10,000 BTU unit running 8 hours a day typically costs between $15 and $30 per month to operate, but this varies widely by region and usage. Check your unit's wattage on the nameplate, multiply by hours of use, divide by 1,000, and multiply by your local electricity rate per kilowatt-hour to calculate your own cost.

Why is my Air King unit leaking water?

Window units have a drain pan that collects condensation and should drain outside through a small hole. If water pools inside your room, the drain hole may be clogged with dust or debris. Locate the drain hole (usually on the outdoor side of the unit) and clear it with a thin wire or pipe cleaner. Portable units collect water in a tank that you empty by hand—if water is leaking from the unit itself rather than overflowing from the tank, the tank may be cracked or not seated properly.

Can I install an Air King window unit myself, or do I need a professional?

Most people can install a window unit themselves in under an hour. The unit comes with mounting brackets and instructions. If your window is very high, heavy, or difficult to access, or if you're not comfortable working near an open window, hire someone to install it. For portable units, setup is even simpler and requires no tools.