How a Clogged AC Line Can Ruin Your Home Sale

By Justin Croft

Justin Croft has a passion for buying and selling residential real estate that is contagious. He is a skilled negotiator and problem solver who thrives on going above and beyond for his clients.

I recently met with a homeowner preparing to sell. During our walkthrough, we discussed their air conditioning unit, and I inquired if they had flushed the drain line. They hadn’t—and they had no idea it could lead to major damage. It’s something I see frequently. The home looks great, and the pricing is right, but one small maintenance issue puts everything at risk. If you’re getting your home ready to list this summer, don’t overlook your AC. It may seem like a minor detail, but if overlooked, it can cause significant damage and derail your plans.

What most homeowners miss about their AC system. When temperatures hit triple digits, your AC can produce 5 to 20 gallons of condensation every single day. That water drains through a small pipe, usually connected to a bathroom or utility sink near the unit in the attic. Over time, dust and debris build up in that line. If it clogs, the water has nowhere to go. The result isn’t just a broken AC—it’s water pouring through your ceiling, walls, or floors.

Two simple fixes that protect your home. First, schedule a quick service call to flush the line. A technician will clear the buildup using compressed air. This helps prevent backups and keeps your system running efficiently during peak season. Second, install a float switch. It costs about $15 and automatically shuts off your AC if water fills the emergency drain pan. It’s an easy way to stop damage before it starts.

Why this matters before you sell. Flooding caused by a clogged AC line is more common than you think. I’ve seen deals collapse because of it. A buyer walks into what should be a clean, move-in-ready home and instead finds stained ceilings or warped floors. The cost of repairs and delays can be significant. The good news is that, with the right preparation, it’s completely avoidable.

If you’re thinking about selling your home or want to make sure it’s protected before the peak of summer, now is the time to take action. I can connect you with reliable local technicians, walk you through exactly what to look for, and help you get your home in the best shape possible before it hits the market.

If you have questions or need guidance, please call me at 214-213-7200, send an email to justin@croftrealestategroup.com, or visit our website at croftrealestategroup.com. Taking care of small details like this now can save you from major problems later and keep your sale on track.