On this page
- Begin with how the unit sits, not with the buttons
- Clear the path in front of and behind the unit
- Wash the filter and let it dry completely
- Know how the water path works before the first humid day
- Expect ice when early-season nights turn cool
- Confirm the size matches the room before blaming the machine
- What a healthy first start looks like
- Put the end of the season on the calendar too
- Which to choose
- Questions people ask
Begin with how the unit sits, not with the buttons
Installation comes before the controls. ENERGY STAR compares the air leak from a badly installed room air conditioner to a 6-square-inch hole in the wall, which undercuts both cooling and comfort. Its guidance is to follow the installation instructions, use the insulation materials supplied with the unit, and set the unit level so water can drain as designed.
Frigidaire's not-cooling page adds the room-side items: the unit should be installed according to the installation guide and use and care manual, in a well-insulated enclosed room, with windows, doors, side curtains and the window framing closed off. Those are the openings that let new air in and make the unit struggle to hold a temperature.
Clear the path in front of and behind the unit
Frigidaire's guidance for a unit that will not cool starts with airflow. Nothing should block or impede air at the entire front or the entire back of the unit, and the side louvers should stay uncovered, because blocked airflow makes the unit struggle to maintain temperature. Curtains, drapes and furniture belong out of the air path.
Outside, the condenser coil should be clean and free of bushes, trees, debris or a winter cover left in place. That last item is easy to miss at the start of the season: a cover that protected the unit through winter becomes a blockage in summer.
Wash the filter and let it dry completely
The filter is the one part worth cleaning before the first hot afternoon rather than after it. Frigidaire's filter page describes the usual layout: the filter sits behind the front grill panel, which is hinged at the bottom, so holding the grill on both sides near the top and pulling forward tilts it down and exposes the reusable filter.
The maker's two cleaning options are warm, soapy water or a vacuum with a brush attachment, and the filter should dry completely before it goes back in. Filter design varies by model, so the Use and Care manual is the final word. More detail sits in how to clean a room air conditioner filter.
Know how the water path works before the first humid day
Water handling differs by type, and getting it wrong hurts efficiency. GE Appliances says window units are built without a drain plug or drain hole for routine draining. A slinger ring around the rear fan blade picks water up from the pan and throws it against the condenser coils, which helps cool the coils and removes some condensation and rainwater. Water can still collect and overflow to the outside on humid or rainy days, and GE calls that normal.
Where a drain plug exists at the bottom of the pan, GE says it should not be removed under normal circumstances; it is there for seasonal storage or for a technician. On models with a sub-base water plug, GE recommends confirming the rubber plug is properly inserted, since removing it lowers efficiency.
Frigidaire's error code page for its room air conditioners lists P1 as a full bottom tray and notes that the tray may be full the first time the unit is turned on for the season. See drain plugs and water trays for the wider picture.
Expect ice when early-season nights turn cool
Early-season weather can be cool enough to create a problem that looks like a failure. Frigidaire's icing page says that when the outdoor air is cool and the unit is in cool mode, the inside coil can be super cooled and ice can form. The page suggests setting the unit to fan only until the ice clears, and letting all ice dissipate before restarting.
Ice can also come from a dirty filter or from curtains and furniture blocking airflow, because the unit cannot pull in enough air to cool. If ice keeps returning after those points are addressed, Frigidaire directs owners to contact service. More on the causes is in what to do when ice forms on a room air conditioner.
Confirm the size matches the room before blaming the machine
Before deciding the unit is weak, confirm it suits the space. ENERGY STAR's sizing guidance warns that an oversized unit cools the room before it has a chance to remove humidity, leaving cool, moist air that feels damp and clammy. Its capacity chart pairs square footage with BTU per hour and adjusts for conditions: reduce capacity by 10 percent for a heavily shaded room, increase by 10 percent for a very sunny one.
A unit that is right for the space needs less help from everything above. The reasoning is covered in choosing the right BTU for your room size and what happens when a room AC is too big.
What a healthy first start looks like
Once the unit is level, clear and clean, a short first run tells you whether anything is off. Frigidaire says the air leaving the front is noticeably cooler than the air the unit draws in, so cold output is the maker's sign of correct operation. Listen for the water sounds of a slinger ring doing its job, and watch the display for codes.
The table below pairs common first-start observations with what the maker's page says about each.
| What you notice at first start | What the maker's page says |
|---|---|
| Cold air from the front | Frigidaire says the unit lowers the temperature of the air it pulls in before blowing it into the room, and cold output indicates correct operation. |
| Water dripping outside | GE says water can collect in the base pan and overflow to the outside in high humidity or rain, which is normal. |
| P1 on a Frigidaire display | The maker lists P1 as a full bottom tray and notes the tray may be full on the first start of the season. |
| Ice on the inside coil | Frigidaire points to a dirty filter, blocked airflow, or cool outdoor air while the unit runs in cool mode. |
| Warm air while the fan runs | Frigidaire says to contact service when the points on its not-cooling page do not resolve the issue. |
Put the end of the season on the calendar too
The start of the season is also the right moment to plan its end. Frigidaire's storage guidance says to remove the unit carefully following the installation instructions, cover it with a plastic sheet or return it to its original carton, and store it in a dry place, standing as it does in the window, not tipped onto its end, face or rear. In a garage or basement, keeping it off the floor protects it from moisture.
ENERGY STAR makes the same case from the efficiency side: removing the unit at the end of the cooling season, when possible, minimizes heat loss, and an appropriately sized cover is the alternative. The steps are set out in taking down and storing a window AC for winter.
Which to choose
| If you | Look for |
|---|---|
| If the unit stayed in the window all winter | Look at the outdoor coil first: Frigidaire lists bushes, trees, debris and winter covers as restrictions that keep a unit from cooling. |
| If the front grill has not been opened since last summer | Pull the hinged panel forward, wash the filter, and let it dry fully before reinstalling it. |
| If the display shows P1 on a Frigidaire unit | The maker lists it as a full bottom tray and notes the tray may be full at the season's first start. |
| If a window unit holds water in the base pan | GE says the drain plug should stay in under normal circumstances, and the sub-base plug should be checked for a proper fit. |
| If early-season nights turn cool | Frigidaire says icing can occur in cool mode; use fan only until the ice clears. |
| If the room feels clammy rather than warm | An oversized unit can cool the air before it removes humidity, so confirm the capacity suits the square footage. |
Questions people ask
Should a room air conditioner be started before the first hot day?
A short run after the leveling, airflow and filter steps is useful. Frigidaire treats cold air at the front as the sign of correct operation, so a brief start confirms that before a hot week arrives.
Does a window air conditioner need its drain plug removed for the season?
GE Appliances says no. The drain plug at the bottom of the pan should not be removed under normal circumstances, and removing a sub-base water plug lowers efficiency.
Why does a Frigidaire unit show P1 at the start of the season?
Frigidaire lists P1 as a full bottom tray and notes that the tray may be full the first time the unit is turned on for the season. The maker says to contact service if the code returns.
How can you tell the unit is cooling as it should?
Frigidaire says the air leaving the front is cooler than the air the unit draws in. When the output is cold, the maker considers the unit to be working properly.
Should the filter be washed or vacuumed?
Frigidaire gives both options: warm, soapy water, or a vacuum with a brush attachment. Either way the filter should be completely dry before it goes back into the unit.
Can ice form on the coil on a mild day?
Yes. Frigidaire says a dirty filter or blocked airflow can cause icing, and so can running cool mode when the outdoor air is cool.