Installing a Through-the-Wall AC with Heat Pump: Can You DIY or Should You Call a Pro?

If you’re eyeing a sleek, year-round comfort solution like a through-the-wall air conditioner with a built-in heat pump, the big question is: Can you install it yourself—or is it better to call a professional?

The appeal of DIY is clear—save money, install on your schedule, and avoid contractor delays. But wall units are a different beast than portable or window systems. Cutting into your wall is a serious commitment.

This guide breaks down:

• 🔧 What it really takes to install one yourself

• 🧱 Step-by-step overview of cutting the wall and mounting the sleeve

• ⚡ What to know about electrical hookups

• ⚖️ When it’s smarter to bring in a pro

• 💰 Cost comparisons and code compliance

• 🔗 Includes 6+ verified resources

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🧊 What Is a Through-the-Wall AC with Heat Pump?

These are permanently installed HVAC systems mounted into an exterior wall. They cool and heat a single room or zone using a heat pump, pulling heat from inside (cooling mode) or outside (heating mode).

Common units:

• 9,000 to 12,000 BTUs

• 208/230V power

• Require a wall sleeve and direct wiring

Unlike portable or window ACs, these:

• Are quieter

• Have no visible cords or hoses

• Provide heating AND cooling

• Require a wall cutout + power supply

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🧰 Tools & Skills You’ll Need to DIY It

Installing one yourself requires basic construction and electrical knowledge.

🧰 Tools:

• Circular saw or oscillating multi-tool

• Drill with masonry bit (for stucco or brick)

• Screwdrivers and nut drivers

• Stud finder

• Level

• Utility knife

• Reciprocating saw (for tougher cuts)

• Caulk gun and weatherproof sealant

🔧 Skills:

• Comfort with power tools

• Basic carpentry (framing, shimming, anchoring)

• Ability to turn off and wire a 230V circuit

• Attention to local building codes

📘 If you’ve done light renovations before (like mounting a TV or swapping an outlet), you're on the right track—but this job is more involved.

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🧱 Step-by-Step DIY Overview

✅ Step 1: Choose the Right Location

• Exterior wall (not load-bearing, ideally)

• Avoid plumbing or electrical paths

• Leave clearance for the unit outside

• Make sure there’s an electrical path nearby

🔗 ENERGY STAR Siting Guide

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✅ Step 2: Install the Wall Sleeve

Most units (like GE, Amana, Friedrich) require a universal wall sleeve (sold separately or as a bundle).

• Mark a cutout using the sleeve’s dimensions

• Cut drywall on the inside first

• Cut exterior cladding (siding, stucco, brick) using proper blade

• Insert the sleeve level and shim if needed

• Seal all gaps with expanding foam or caulk

• Screw or anchor the sleeve to studs

💡 Tip: Use a sleeve with rear drainage support and rust-proof coating.

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✅ Step 3: Slide In and Secure the AC/Heat Pump Unit

• Remove rear grille and any packaging

• Slide unit into the sleeve

• Secure per manufacturer instructions (typically 2–4 screws)

• Attach grille, filter, and front panel

• Test for vibration or looseness

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⚡ Step 4: Electrical Hookup (The Tricky Part)

Most heat pump wall units run on 208/230V and require:

• Dedicated double-pole breaker (15–20A)

• Properly sized wiring (usually 12 or 10 gauge)

• GFCI protection (depending on local code)

• Hardwired connection or plug (some models allow both)

Not comfortable with this part? Call a licensed electrician. Mistakes here can be dangerous or void your warranty.

🔗 National Electrical Code (NEC) Overview

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🛠️ Key Installation Challenges (and How to Overcome Them)

💡 Don’t forget to pull a permit if required by your municipality. Some towns require inspection for any 230V appliance hookup.

🔗 Find Local Code Requirements – ICC PublicACCESS

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📋 When to Call a Pro Instead

You should consider professional help if:

• You’ve never cut into a wall before

• You don’t feel confident wiring a 230V circuit

• Your wall is brick, concrete, or load-bearing

• You’re dealing with mold, asbestos, or existing insulation issues

• Your local codes are strict and require inspection

What a Pro Offers:

• Safer electrical installation

• Precision wall cutting with less risk of damage

• Access to sleeves, trim kits, and weatherproofing tools

• Code-compliant, warrantied work

📞 Expect to pay $700–$1,200 for full install labor (sleeve, wall cut, wiring).

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💰 DIY vs. Professional Install: Cost Breakdown

 

🧯 Safety Considerations

• Always turn off power at the panel before working

• Wear gloves, goggles, and a dust mask while cutting

• Use a GFCI circuit if your model requires it

• Secure all wires in approved conduit or junction boxes

• Seal and weatherproof your wall cutout thoroughly

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🌎 Energy Efficiency & Tax Credit Notes

ENERGY STAR®-rated through-the-wall heat pump units may qualify for:

• Federal tax credit (25C) up to $2,000

• State and utility rebates

• Efficiency score increases on home appraisals

🔗 DSIREUSA.org – Find Local Rebates
🔗 IRS Form 5695 for Energy Credits

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🔄 Summary: DIY vs. Pro — Which Is Right for You?

If you’re comfortable with cutting, measuring, leveling, and following instructions, DIY is a totally reasonable option. Just plan carefully, take your time, and call an electrician if needed.

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In the next topic we will read about: Can You Expand the MRCOOL 4-Zone System Later? Futureproofing Your Install