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Mitsubishi Wall Mount Mini-Split Installation — Oklahoma
The wall mount is the workhorse of the mini-split world, and I’ve installed more of them than I can count across central Oklahoma. It’s the right call for a garage, a bonus room, a bedroom that your main system can never get right, a sunroom addition — any space where you need targeted, efficient heating and cooling without running new ductwork.
Mitsubishi wall mount mini-splits are the most popular indoor unit type — single-zone or multi-zone, starting at $1,999 installed. Hartzell’s is a Mitsubishi Diamond Dealer in Kingfisher, Oklahoma. Call 405-375-4822 for a free same-day estimate.
Highest Mitsubishi Contractor Certification
◆ Mitsubishi Diamond Dealer
One of only a handful of Diamond-certified contractors in all of Oklahoma. Factory trained. Factory accountable on every install. There is exactly one thing only Diamond Dealers can offer you:
Standard dealer warranty
5 yrs
Hartzell’s Diamond warranty
12 yrs
12-year parts and labor. Registered at startup. No extra cost to you.
Trane Unstoppable Event — Ends June 30, 2026
0% Financing for 60 Months
+ Up to $900 Back
Up to $900 Rebate
Price Today — Install Tomorrow
Stack with Oklahoma utility rebates. Call 405-375-4822
Is a Wall Mount Right for Your Space?
- Do you have one room or space that’s always too hot or too cold?
- Is it a garage, sunroom, bonus room, or home office?
- Would you rather not tear into your ductwork to add a new branch?
- Do you want both heating and cooling from one unit?
- Is quiet operation important — bedroom, office, sleeping baby?
If yes to most of these, a wall mount is almost certainly the right unit for you.
What Is a Mitsubishi Wall Mount Mini-Split?
A wall mount has two components: an indoor head unit that mounts high on the wall and circulates air across the room, and an outdoor compressor connected via a small refrigerant line through a 3-inch wall penetration. No ductwork, no major construction. Mitsubishi’s inverter compressor ramps up or down based on demand rather than cycling on and off — that’s what makes them efficient and quiet.
Mitsubishi Wall Mount Models We Install
| Series | BTU Range | SEER2 | Best For |
|---|---|---|---|
| M-Series (GL/FS) | 6K-24K BTU | Up to 40 | Bedrooms, offices, single zones |
| M-Series (FH/GC) | 6K-36K BTU | Up to 33 | Garages, larger rooms, Hyper-Heat |
| P-Series (CA) | 6K-24K BTU | Up to 24 | Multi-zone applications |
How Much Can a Wall Mount Save on Your Electric Bill?
| System | SEER2 | Est. Monthly Cost (400 sq ft) |
|---|---|---|
| Window AC | 10-12 | $55-70 |
| Central HVAC (whole house for one room) | 14-18 | $80-120+ |
| Mitsubishi wall mount | 22-40 | $18-30 |
In heating mode the savings are even more dramatic — Mitsubishi heat pumps deliver 2.5-3.5 units of heat per unit of electricity. Electric resistance heat delivers 1. See the full energy savings breakdown →
What Size Do You Need?
The most common mistake is picking a unit based on square footage alone. Here’s what actually determines correct sizing:
- Square footage — base calculation
- Ceiling height — 10-foot ceilings need more capacity than 8-foot
- Insulation quality — a well-insulated addition needs less than a leaky garage
- Window area and direction — west-facing windows in Oklahoma add significant heat load
- How the space is used — a server room or workshop runs hotter than a bedroom
Oversizing is actually a problem — an oversized unit short-cycles, causing humidity issues and premature wear. I do a proper load calculation every time.
Frequently Asked Questions — Mitsubishi Wall Mount Mini-Split
How much does a Mitsubishi wall mount mini-split cost installed in Oklahoma?
A single-zone Mitsubishi wall mount starts at $1,999 installed through Hartzell’s. Price varies based on BTU size, line set length, and electrical work needed. Call 405-375-4822 for a free estimate — I can usually give you a number same day.
What size Mitsubishi wall mount do I need for my room?
Rough guide: 6,000 BTU covers up to 250 sq ft, 9,000 BTU up to 400 sq ft, 12,000 BTU up to 550 sq ft, 18,000 BTU up to 800 sq ft, 24,000 BTU up to 1,200 sq ft. Square footage alone isn’t the whole picture — insulation quality, ceiling height, window area, and sun exposure all affect the right size. I do a proper load calculation before recommending any unit.
How efficient is a Mitsubishi wall mount compared to a window AC unit?
A Mitsubishi wall mount is dramatically more efficient than a window unit. Window ACs run around SEER 10-12. Mitsubishi wall mounts run SEER2 22-33 on standard models — some M-Series units reach SEER2 40. That can cut your cooling cost for that room by 50-60%.
Does a Mitsubishi wall mount heat as well as cool in Oklahoma winters?
Yes. All Mitsubishi wall mount units are heat pumps — they heat and cool. Standard units work efficiently down to 5°F. Hyper-Heat (H2i) models work down to -13°F. Oklahoma winters rarely hit those extremes, so any Mitsubishi wall mount handles our winters well.
Where on the wall does the indoor unit get mounted?
Typically high on the wall, 6-8 inches below the ceiling. This lets the unit circulate air across the full room. Exact position depends on room layout, line set routing, and furniture placement. We walk through this before drilling anything.
How noisy is a Mitsubishi wall mount mini-split?
Very quiet. Mitsubishi wall mounts run as low as 19 dB on low fan speed — quieter than a whisper (about 30 dB). Most people say they can barely hear it. The outdoor unit is also significantly quieter than a traditional AC compressor.
How long does installation take for a Mitsubishi wall mount?
Most single-zone installations take 4-6 hours. We mount the indoor head, run the line set through a 3-inch wall penetration to the outdoor unit, make electrical connections, and commission the system. You’re up and running same day.
Does a Mitsubishi wall mount work in a garage or shop?
Absolutely — one of the best applications. Garages and shops have high ceilings and poor insulation, which makes them hard to condition with other methods. We install a lot of these in garages and agricultural buildings across central Oklahoma.
What warranty comes with a Mitsubishi wall mount installed by Hartzell’s?
As a Diamond Dealer, Hartzell’s activates the 12-year parts and labor warranty on every system we install and register. Standard Mitsubishi warranty through non-Diamond dealers is 5 years. That extra 7 years costs you nothing.
Can my power company give me a rebate on a Mitsubishi wall mount?
Possibly yes. OG&E offers $1,500 per unit (max $3,000). OEC offers $200-$325 per ton on air-source heat pumps. Cimarron Electric and KPWA have programs in the Kingfisher area. I’ll tell you exactly what you qualify for before we start.
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