Are these two the same unit?

Yes. Both are the MRCOOL DIY 5th Gen 18,000 BTU 230V single-zone heat pump. The model number DIY-18-HP-WM-230D25-O on the B listing matches the 5th Gen DIY line. Buy on price and seller.

Which is better for cold climates?

The A listing states heating down to -13 F outdoor, which is the useful figure for cold winters. The B listing does not state a minimum heating temperature, so confirm it before buying for a cold climate.

Is the 20.5 dB noise rating real?

Treat it with caution. The A listing says 54 dBA, which is typical for an 18K system. 20.5 dB is quieter than a whisper and unlikely at full output. Expect Quiet Mode to be the low figure.

How hard is the install?

The QuickConnect pre-charged line set removes vacuuming and brazing, so a handy homeowner can do it. You still need a dedicated 230V circuit, and the warranty may require a licensed installer.

Same hardware, so the same lifespan. The Gold Fin condenser coating on the A listing helps in coastal or salty air. Real life depends on install quality and filter cleaning.

Is one worth extra money?

No. Paying more for the same model buys nothing. Compare landed price including freight, and check the return policy on freight damage.

MRCOOL DIY 18K BTU 22.5 SEER2 5th Gen Ductless Mini Split Heat Pump System - 230V vs MRCOOL DIY 5th Gen 18000 BTU 230V Ductless Mini Split Heat Pump AC

These are the same MRCOOL DIY 5th Gen 18K single-zone heat pump sold under two listings, so the hardware decision is already made. Buy whichever listing is cheaper from a store you trust, and check the price history before you order. The specs conflict in places (SEER2 23.6 vs 23.9, 54 dBA vs 20.5 dB, 65.5 lb vs 163.8 lb), so confirm the exact model number DIY-18-HP-WM-230D25-O with the seller.

Ask our shopping agent