Hey Homeowners!
Hey there, friends—it’s your buddy Jake back in action 🤠. Today we’re tackling one of my favorite home upgrades: through-the-wall air conditioners. Whether you’re putting one in for the first time or you’re here because your existing unit is making some crazy noises, I’m going to walk you through this like we’re hangin’ in my garage with a couple of cold drinks 🍻.
No worrying about tech jargon or confusing steps. My goal is simple: help you feel comfortable enough to do this yourself. From picking the right unit to making sure it’s level, sealing up the edges, and troubleshooting like a pro if something doesn’t sound quite right, we’re covering all of it. Buckle up and let’s get you and your AC working like a dream—no sweat!
Why Go Through‑The‑Wall? 🧊
Through‑the‑wall (TTW) ACs are the sweet spot when window units aren’t an option. They free up window space, blend in seamlessly, and tend to be more secure than sash-style window models. The U.S. Department of Energy emphasizes energy efficiency when units are properly sealed—so TTW units can save you some serious green 💵 compared to central AC or space heaters in winter.
Check out Energy.gov for how these systems stack up on efficiency.
📏 Pre‑Installation Prep — Pick, Measure, and Gather
Before you ever drill a hole, make sure you choose the right BTU output for your space. Check out the U.S. Department of Energy’s guide on proper AC sizing to nail that. Typically, you need about 20 BTU per square foot — so a 10,000 BTU unit will cover around 400–450 square feet.
Measure your wall opening carefully per the manufacturer’s instructions and give your wall a good once‑over for any hidden wiring or pipes — a stud finder is your best friend. Gather all your tools too: a saw, drill, level, foam insulation, exterior caulk, and of course, safety glasses. A solid install means less noise and better efficiency down the road.
🛠️ Installing the Unit — Step by Step
1. Cut the hole: Drill corner holes and use a saw to cut clean edges.
2. Install the sleeve: Make sure it’s level and tilted slightly outward for drainage — about a ¼‑inch drop.
3. Secure and seal: Attach the sleeve with screws, then seal every gap with exterior caulk. According to This Old House’s AC install tips, good sealing is what keeps water and drafts outside.
4. Slide in the AC unit: Fit it snugly into the sleeve, secure the front panel, and plug it into a properly rated outlet.
5. Insulate the edges: Fill all interior gaps with foam — this keeps your conditioned air inside and bugs outside.
Want even more information on installing your wall AC? Visit my guide: Jake’s Hardcore Installation Masterclass.
⚡ Troubleshooting — What to Check
Nothing throws a wrench in your day like an AC that stops blowing cold or starts making weird noises. But most issues are easy to tackle:
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No cooling? Check the filter — clogged filters restrict airflow and reduce cooling capacity. Give it a good clean every few weeks; the EPA has a great primer on maintaining ACs.
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Buzzing or rattling? Likely loose screws or a slightly tilted unit. Shut off the unit and tighten everything up.
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Water leaks inside? Double-check that the unit slopes slightly to the outside. That tiny tilt lets water drip properly. If the slope is good but you still see leaks, add foam insulation around the edges or reseal the outside with caulk.
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Still not cooling enough? If you hear the compressor kicking on but still get warm air, you might be looking at a refrigerant issue — that’s one to call in a pro HVAC tech.
And remember, seasonal maintenance goes a long way toward preventing all these problems. The Energy Star program recommends you clean the filters monthly and give the unit a thorough check every spring before the heat waves hit.
🧼 Cleaning and Maintaining Your AC Unit
Your AC will last much longer — and work much better — if you take a little time to clean and maintain it regularly. Start by unplugging the unit. Remove the front panel carefully and take out the filter. Give the filter a gentle rinse with warm, soapy water and let it dry completely before putting it back. Use a soft brush or cloth to clean the coils, fan, and any visible dust inside the unit. Be careful not to bend the delicate fins — they’re crucial for proper airflow.
Cleaning every few weeks during peak summer use keeps your air fresh and your energy bills lower. Don’t skip this simple chore; it can make all the difference between a smooth-running unit and one that struggles to keep up!
🧰 Knowing When to Call a Pro
Let’s face it — even the most hands‑on homeowner hits a wall sometimes. Installing and maintaining a through‑the‑wall AC is doable, but a few jobs are best left to the professionals. Here’s when it’s smart to put down the tools and pick up the phone:
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Electrical Wiring Issues: If you discover old wiring, need to add a dedicated circuit, or your breaker trips constantly, it’s safest to call a licensed electrician.
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Major Refrigerant Problems: Refrigerant handling requires specialized tools and certifications. If your unit isn’t cooling and you suspect a leak or low refrigerant, that’s a pro’s job.
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Structural Surprises: Found unexpected wires or plumbing in your wall? Don’t cut blindly. Have a contractor or inspector help you plan around these.
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Persistent Mechanical Issues: If strange noises, burning smells, or repeated freezing up happens even after basic cleaning and troubleshooting, a certified HVAC technician can save you time and future repair bills.
Knowing when to call in backup isn’t a failure — it’s just part of keeping your home safe and comfortable. When in doubt, don’t hesitate to reach out to a trusted pro and protect your investment.
❄️ Jake’s Cool-Down Outro
And that’s the whole ballgame, my friends — a smooth installation, a snug fit, and a few quick troubleshooting tricks to keep that AC cranking all summer long. Treat your unit right, and it’ll keep you comfy for years to come.
If you’re looking for the perfect through‑the‑wall unit to suit your space, check out the awesome selection at The Furnace Outlet. They make finding the right fit super simple. Until next time — stay chill, stay safe, and keep it cool out there 🧊💪!
- Jake OUT!
