# MRCOOL Universal — user reviews

> 6 indexed App Store user reviews of MRCOOL Universal by HaiLin Energy Technology Inc., rated 1.43/5 from 14 ratings.

- Source: https://appshunter.io/ios/app/mrcool-universal/id1506149089/reviews
- App overview in markdown: https://appshunter.io/ios/app/mrcool-universal/id1506149089.md
- Rating breakdown: 5★ 1 · 4★ 0 · 3★ 1 · 2★ 0 · 1★ 12

## Most critical reviews (6 lowest-rated)

### 1/5 — Worked for a while and then lost connection.

*2024-06-09*

This thermostat and my other MRCOOL mini split smart controller both stopped working.  Attempted to fix the mini split first. Ingrams wouldn’t replace the defective module while it was still in warranty.  Don’t buy MRCOOL products in the long run there’s a reason they are cheap.  Was considering another 4 ton unit but if you can’t get help on the simple issues imagine losing a compressor. You will wind up replacing the whole unit because of no support.

### 1/5 — Waste

*2022-03-24*

Doesn’t work at all

### 1/5 — MR Cool WIFI Thermostat

*2022-02-03*

Don’t work at all not able to connected to WIFI not able to scans the bar code complete useless and bad customer service front MR Cool trying to reach them for support never able to get I shut be get a full Refund of this Thermostat

### 1/5 — Doesn’t work

*2021-05-31*

It doesn’t actually change settings from the app. I try to change them and nothing changes on the thermostat. Then the app just goes back to what the thermostat is set to.

### 1/5 — Doesn’t work

*2020-12-05*

Doesn’t work at all. Doesn’t scan to add device either. Don’t waste your time with this app

### 5/5 — Works great

*2020-06-29*

Works great

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-04.*