The Window Unit in the Only Bedroom Window
Why this matters
A handyman shop installed a window air conditioner the customer had bought, in a basement bedroom, and fastened it in so it would not shift. It worked well for two summers. Then the house went on the market and the buyer's home inspector wrote it up: the room's only window was its emergency escape and rescue opening, and it was full of air conditioner. Nobody had been hurt, and nobody had needed to get out. What follows is how the shop handled the next twelve days with a sale pending, what it decided it owed, and the question it now asks before any install that goes in a window.
The finding, and why it is a real one
The inspector's note was one line: "Basement bedroom egress window obstructed by window AC unit, secured with fasteners." The seller called the shop the same afternoon, worried mostly about the closing.
The shop's owner, Ruth, went out the next morning and measured before saying anything. The window was a single-hung unit in a window well. With the lower sash fully raised and the AC removed in her head, the clear opening the sash left was 32 inches wide by 25 inches high, with the sill 42 inches above the bedroom floor.
BASEMENT BEDROOM WINDOW, LOWER SASH RAISED
+----------------------------------+
| upper sash (fixed) |
+----------------------------------+ <- raised lower
| | sash
| clear opening 32 in wide |
| 25 in high |
| = 800 sq in = 5.56 sq ft |
| AC unit sat here, with side |
| panels filling the rest, and |
| brackets screwed to sill + sash |
+==================================+ sill 42 in
above floor
Against IRC R310 in the 2021 edition, as adopted: a below-grade opening needs at least 5.0 square feet of net clear opening (the general figure is 5.7, and the 5.0 applies to grade-floor and below-grade openings), at least 24 inches of clear height and 20 inches of clear width, a sill no higher than 44 inches above the floor, and it must open from inside without keys, tools or special knowledge. The window itself passed every line: 5.56 against 5.0 square feet, 25 against 24 inches, 32 against 20 inches, 42 against 44 inches.
Ruth also checked the window well, because a below-grade opening is only as good as the space outside it. The IRC's area-well provisions in the same section call, in substance, for a well of at least 9 square feet with at least 36 inches in each horizontal direction, and a permanent ladder or steps when the well is deeper than 44 inches; the subsection numbers have moved between editions, so check yours. This well measured 40 inches out from the wall by 38 inches wide, which is 1,520 square inches or 10.6 square feet, and it was 48 inches deep, so it needed a ladder, and it had one molded into the well liner. It also had the air conditioner's rear housing hanging into it about 16 inches, with a puddle of condensate and leaves under it. The well passed on paper and was obstructed in fact, by the same appliance.
With the air conditioner in it, the window failed the one line that matters at 3 a.m. The unit's brackets were screwed into the sill and the sash, its side panels screwed to the sash track, and the unit itself weighed about 60 pounds. To get out, someone would have needed a screwdriver, then the strength to lift a heavy unit out of a sash at chest height, in the dark, in smoke. The code's test is whether the opening works for escape and for a firefighter coming in. It did not. See related: Egress Window Code Compliance Per IRC R310.
Contain first: the twelve days
The closing was twelve days out, it was July, and the room was the seller's son's bedroom. Ruth laid out the options the same morning.
- Remove the unit and restore the window now. Fastest, and it ends the hazard today. The cost was the room's comfort for the rest of the summer.
- Move the unit to another window in the room. There was no other window. The room had one.
- Swap to a portable air conditioner vented through the window. This was the seller's suggestion. Ruth declined it on the same reasoning: the vent kit's panel fills the same opening, and while some kits lift out by hand, a person escaping still has to know that, find it and clear it. The test is the opening, not which appliance is in it.
- Leave it until closing and let the buyer deal with it. Not something the shop would do. The son was sleeping in that room every night.
The seller chose the first option. Ruth's crew unplugged the unit at its receptacle and pulled it that afternoon, lifting it with two people from inside the room, because a 60 pound unit balanced on a sill at chest height is a back injury or a dropped unit in the well, removed the brackets, cleared the leaves and standing water out of the well, filled the screw holes in the sash and sill, and opened and closed the window three times to confirm it ran its full travel without binding and the latch released by hand. They stored the AC in the garage. Ruth photographed the open window with a tape measure in the frame showing the 25 inch height, and sent that to the seller for the inspector.
Then she talked to the seller about what came next.
The conversation about what was owed
Ruth's position was direct: the shop had been asked to put a customer's unit in a customer's window, and it had done that competently. It had not been asked whether the window was the bedroom's way out, and it had not asked. A shop that installs things in windows for a living should know which windows in a house are escape openings, and should ask before it fastens anything into one. That was the shop's miss, not the customer's.
So the shop removed the unit and restored the window at no charge, and said so in writing. Ruth was also clear about what she was not saying. Whether the sale's terms, the inspector's report or a buyer's demand created any obligation beyond that was a question for the seller's agent and attorney, not for her, and she said so in the same email.
The permanent answer, quoted
The room still needed cooling for the son's last weeks there and for whoever lived in the house next. Ruth's shop does not do refrigerant work, so she brought in an HVAC partner whose technicians are certified for it under the EPA's Section 608 rules, and the quote that came back was a single-zone ductless mini-split.
The reason it works where the window unit did not: a mini-split's indoor head mounts high on a wall, and its refrigerant lines, condensate drain and control wiring leave the room through a small hole of about 3 inches, not through the window. For this room, the lines went out through the rim joist above the foundation wall on the side of the house, to a condenser on a pad outside. The window stayed a window.
Two other permanent options were considered and set aside, and each is the right call in a different house:
- A through-the-wall sleeve unit. It needs a framed wall to the outside. This room's only exterior wall was poured concrete foundation below grade, and cutting a sleeve through it was a structural question the job did not justify.
- Extending the central system's ductwork. The house's air handler was at the far end of the basement and already short on capacity for the finished space. The HVAC partner would not add a run without a load calculation, and the mini-split was the simpler answer.
The seller decided to leave the mini-split decision to the buyer, with the quote in the disclosure package. The window, open and clear, was reinspected and the note was closed.
Where the miss actually sat
When Ruth traced back how it happened, the install itself was fine. The miss was earlier, at intake. The work order two summers before read: "Install customer-supplied window AC, basement bedroom. Customer wants it secure." Every fact needed to catch the problem was in that sentence: a bedroom, a basement, and a request to fasten. Nobody on the call or on the crew read those three together.
The handyman who did the install remembered thinking the window was small and the room had only one, and that it was not his business. Nothing in the shop's practice told him it was.
The question added to intake
The shop now asks two questions before scheduling any work that puts something in, on or across a window, and the office cannot book the job with either blank:
WINDOW INSTALL INTAKE
Room: ____________ (bedroom / basement / other)
1. Is this room a bedroom, or a finished basement or
attic space someone could sleep in? Y / N
2. Is there any other window in the room big enough
to climb out of? Y / N
If 1 = Y and 2 = N: do not fasten anything into this
window. Offer: other window, mini-split, sleeve.
Tech confirms on site before install: ________
The same rule reaches past air conditioners. Security bars, a fixed screen, a shelf built across a basement window, a dryer vent run through a sash: anything that turns an escape opening into something that needs tools to clear is the same finding. See related: How to Place a Window Air Conditioner Without Blocking the Only Egress, and How to Check Bars, Grilles and Well Covers for Release From Inside.
In the eight months after the change, the office flagged five window jobs where question 1 was Y. Two of those had question 2 as N. Both customers took a different window or a referral; neither job went into the only window. That is two rooms the old practice would have closed off without anyone noticing.
References
- International Residential Code R310, emergency escape and rescue openings, 2021 edition as adopted by your jurisdiction; it binds the dwelling and reaches the installer through what the opening must still do.
- U.S. EPA refrigerant management rules under Section 608 of the Clean Air Act, for technician certification on refrigerant-containing equipment.
- See related: The Egress Window and the Trades That Quietly Defeat It
- See related: How to Measure an Egress Window Net Clear Opening
- See related: Egress Window Code Compliance Per IRC R310