Hi, I’m Samantha! When I decided to install a 15,000 BTU through‑the‑wall AC, I assumed the only real expense would be the unit itself. But once I factored in the wall sleeve, electrical upgrades, labor, and finishing touches, I realized the true cost was much higher.
If you’re budgeting for your own installation, this guide will break down everything you need to know about costs — so you’re not caught off guard like I was.
We’ll cover:
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The cost of the AC unit & accessories 🏷️
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Electrical work you may need 🔌
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Labor charges based on wall type 🛠️
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Hidden extras homeowners forget 🧰
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DIY vs professional installation 🛡️
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Real‑world cost ranges 📊
By the end, you’ll have a clear picture of what a 15,000 BTU through‑the‑wall AC installation really costs in 2025.
🏷️ 1. Equipment Costs
The AC unit itself is the biggest line item — but not the only one.
The Unit
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Budget models (GE, Hotpoint): $650–$800
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Mid‑range (LG, Amana): $750–$950
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Premium (Friedrich, higher‑end LG models): $900–$1,200+
💡 Samantha’s note: I picked a Friedrich unit because I wanted it quiet and durable, which pushed me toward the higher end.
The Wall Sleeve
A wall sleeve is non‑negotiable. It stabilizes the unit, insulates the wall, and protects against moisture.
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Universal sleeve: $100–$200
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Manufacturer‑specific sleeve: $150–$300
💡 Lesson learned: My installer told me that using a mismatched sleeve could void my warranty. I went with the Friedrich‑recommended sleeve.
Rear Grille (Optional but Smart)
Protects against debris, rodents, and weather.
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$40–$80
💡 Samantha’s tip: I skipped it once — and a family of wasps moved in. Never again.
Heat Pump or Smart Features
If you want year‑round comfort or Wi‑Fi control, expect to add:
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Heat pump option: +$200–$300
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Wi‑Fi / smart control: +$50–$150
🔌 2. Electrical Work
This was the biggest surprise in my installation.
Voltage
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Many 15,000 BTU units require 230V outlets.
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Standard homes usually have 115V outlets, meaning an upgrade is likely.
Costs
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New 230V outlet installation: $200–$400
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Dedicated 20A circuit: +$100–$200
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Electrical panel upgrade (if needed): $500–$1,200
💡 Samantha’s story: My Friedrich needed a 230V outlet, and I paid $350 to an electrician for the upgrade. It was worth it for safety and performance.
🔗 Energy Star – Room Air Conditioners
🛠️ 3. Labor Costs
Wall Type Matters
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Drywall with siding: $200–$500
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Brick or stucco walls: $500–$1,000
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Stone or older construction: $800–$1,200+
Full Professional Installation
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$600–$1,200 including electrical and weatherproofing
💡 Samantha’s tip: If you live in an older home, get a quote before buying — cutting into brick added an extra $300 for my neighbor’s project.
🧰 4. Extras & Hidden Costs
Here’s where homeowners often get blindsided:
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Weatherproofing supplies: $25–$75 (caulk, flashing, insulation foam)
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Interior trim kits: $30–$100 for a clean finish
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Permits: $50–$150 depending on your county
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Disposal of old unit: $50–$100 if not DIY
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Annual maintenance plan: $100–$150/year
💡 Samantha’s tip: My installer didn’t include trim — I had to run back to Home Depot for $60 worth of finishing panels.
🔗 This Old House – Through-the-Wall AC Install Guide
📊 5. Total Cost Breakdown
Here’s the big picture:
| Item | Cost Range |
|---|---|
| AC Unit | $650–$1,200 |
| Wall Sleeve | $100–$300 |
| Rear Grille | $40–$80 |
| Electrical Work | $200–$500 |
| Labor (basic install) | $200–$500 |
| Extras (trim, caulk, permits) | $100–$250 |
| Estimated Total | $1,200–$2,500 |
💡 Samantha’s actual cost: $1,950 (Friedrich unit + 230V upgrade + pro installation + trim).
🛡️ 6. DIY vs Professional Installation
DIY Installation
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Possible if:
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You have carpentry skills
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The wall sleeve is already in place
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Your unit runs on 115V (no electrical upgrade needed)
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Costs saved: $400–$800
⚠️ Risks:
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Incorrect slope can cause water damage.
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Poor sealing leads to air leaks and pests.
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Voided warranty if sleeve isn’t installed correctly.
Professional Installation
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Strongly recommended if:
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Cutting into brick, stucco, or stone
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You need a 230V outlet
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The wall is load‑bearing
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💡 Samantha’s rule: “If you’re touching electrical or cutting into structure — hire a pro.”
🔗 Family Handyman – Wall AC Install Tips
🏡 7. Ways to Save on Installation
If the $2,000 ballpark makes you nervous, here are tips:
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Shop off‑season: Prices for AC units drop in fall and winter.
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DIY the finishing work: Install trim and weatherproofing yourself.
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Use financing or rebates:
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Some Energy Star models qualify for local utility rebates.
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DSIRE USA lists available energy rebates.
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Buy as a package: Some retailers discount sleeves when purchased with the unit.
✅ Samantha’s Takeaway
Installing a 15,000 BTU through‑the‑wall AC isn’t just about the sticker price of the unit. With all the extras, you’ll likely spend $1,200–$2,500.
The good news? Once installed properly, these units provide years of quiet, efficient comfort. And if you budget correctly, you won’t face unpleasant surprises.
💡 Samantha’s final thought: “Budget on the high end. If you save money, it’s a bonus — but if you underestimate, you’ll regret it.”
In the next topic we will know more about: Maintenance Tips for 15,000 BTU Wall ACs: Filters, Coils & Seasonal Care
