28,000 BTU heat pump

DIYCOOL 28,000 BTU Wall-Mount

Name: DIYCOOL 28,000 BTU Wall-Mount
Brand: DIYCOOL

Model #: ES-27Z-M3B

Every spec on this page comes from an official certification record or a cited manufacturer document. The source is linked next to each value.

DIYCOOLESMini-split heat pump

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Decision guide

What the published numbers mean before you compare every spec.

28,000 BTU is closest to ENERGY STAR’s 1500–2000 sq. ft. room-size row.

At 5°F, certified output is 18,700 BTU/h — 67% of its 47°F rating.

The cited fields do not confirm a pre-charged line set or DIY-line designation for this model.

Voltage is not published in the sources we cite, so confirm it before choosing equipment.

HSPF2 9.2 is below the 9.8 average among 74 models in the same rounded capacity class.

Your room is near 1500–2000 sq. ft. under the ENERGY STAR starting-point assumptions, and a load calculation agrees.

You have not confirmed the voltage, room load, and installation requirements for this exact model.

Room guidance is a screening estimate for standard conditions. Check your room inputs; use Manual J for final sizing.

Outdoor model number	ES-27Z-M3BSource: ENERGY STAR Mini-Split Heat Pumps dataset · 2026-07-23
AHRI reference number	210857405Source: ENERGY STAR Mini-Split Heat Pumps dataset · 2026-07-23
Series	ESSource: ENERGY STAR Mini-Split Heat Pumps dataset · 2026-07-23
Heating capacity at 47F	28,000 BTU/hSource: ENERGY STAR Mini-Split Heat Pumps dataset · 2026-07-23
Heating capacity at 17F	22,000 BTU/hSource: ENERGY STAR Mini-Split Heat Pumps dataset · 2026-07-23
Heating capacity at 5F	18,700 BTU/hSource: ENERGY STAR Mini-Split Heat Pumps dataset · 2026-07-23
SEER2	21Source: ENERGY STAR Mini-Split Heat Pumps dataset · 2026-07-23
EER2	11.7Source: ENERGY STAR Mini-Split Heat Pumps dataset · 2026-07-23
HSPF2	9.2Source: ENERGY STAR Mini-Split Heat Pumps dataset · 2026-07-23

Values marked ENERGY STAR come from the certification dataset; values marked Manufacturer spec come from the linked product documents.

The sources we cite do not publish these values for this model, so we leave them blank rather than guess.

Indoor model numberVoltageMinimum circuit ampacityMaximum breaker / fuseLine set length rangePre-charged line setBrand DIY line

Room-size guidance is a starting point, not a load calculation. Confirm sizing and installation requirements with a qualified contractor.