The 4 Tiers of Mini-Split Technology — and Where Airspool Fits In

If you’ve been comparing mini-split prices online, you’ve probably wondered:

“Why does Airspool cost more than other 12,000 BTU systems?”
“Is Airspool really better than EG4 or MrCool?”

Let’s break that down honestly.
There are four tiers of mini-split technology on the market today — and once you understand them, you’ll see why Airspool sits at the top in terms of ease, value, and respect for your time. 

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Tier 1 — Standard Mini-Splits (Non-Inverter, Non-DIY)

What are the cheapest mini-splits missing?
These older systems use fixed-speed compressors that simply turn on and off.

That design means:

• Lower efficiency (typically 14–17 SEER2)

• Harsh current spikes on startup

• Incompatibility with solar (you’d need 4-to-6× more panels to handle the surge)

• Professional installation required

They’re inexpensive at checkout — but expensive to operate, install (since you'll either need to do the vacuum pump and gauge work, plus the electrical work, yourself, or hire someone to do this), and maintain.

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Tier 2 — Inverter Mini-Splits (Non-DIY)

What’s the difference between inverter and non-inverter mini-splits?
Inverter compressors adjust speed continuously to match demand. That’s why these systems run quieter and reach efficiencies around 18–22 SEER2.

They’re the “sweet spot” for many well-known HVAC brands — efficient and reliable, but still grid-only and require a knowledgeable installer.
Typical warranties here: 3-year parts / 5-to-7-year compressor coverage.  To run one of these units on solar, though, you'd need batteries, and inverter and an MPPT or PWM controller.

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Tier 3 — Inverter + DIY Mini-Splits (Grid-Only)

Is there a DIY mini-split I can install myself?
Yes — this is where the MrCool-style systems come in. They use pre-charged line sets so homeowners can handle installation without specialized tools.  But, taking Mr. Cool specifically, for instance, the unit doesn't come with a power cord and doesn't feature pre-wired twist-to-connect communication control wires.

They’re great for grid-powered homes wanting a fast install, but they don’t integrate with solar.
Expect ~20–23 SEER2 and a 5-year parts / 7-year compressor warranty.

Somewhat convenient? Yes.
Solar-ready? No.

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Tier 4 — Inverter + DIY + Solar-Ready Mini-Splits (Airspool Tier)

What is a solar hybrid mini-split, and how is it different from EG4 or MrCool?
This is the newest category — units that can run directly on solar DC power.

Airspool’s MS12 model leads this tier with:

• 22.5 SEER2 inverter compressor that ramps smoothly and eliminates surge current

• True solar readiness — runs from rooftop DC power without extra batteries or inverters

• DIY installation using our Quick ’n’ Easy™ connection system

• Bundled essentials: isolator switch, solar whips & wire, labeled hardware

• Factory vacuum & electrical testing before shipment

• App monitoring to track solar savings and usage

• 5-Year Modular Guarantee — if one half fails, we ship a replacement half

How is this different from other solar DIY units (like EG4)?
Most “solar-capable” DIY systems don’t include the isolator, the power cord, pre-wiring, solar wiring kit, pre-testing, or full 5-year modular coverage. They’re solid attempts — but Airspool goes further by handling the complete setup process and standing behind it with a single-unit guarantee.

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