42,000 BTU/ 3.5 TON

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42,000 BTU (3.5 Ton) Ductless Mini Split AC & Heat Pumps

The 42,000 BTU (3.5 ton) ductless mini split air conditioner is built for powerful, year-round heating and cooling. With a robust 42K BTU output, it’s a reliable alternative to bulky packaged AC units in spaces where traditional ductwork isn’t practical. Thanks to inverter-driven compressors, these systems deliver energy efficiency, whisper-quiet operation, and consistent indoor comfort.

Choosing a ductless mini split gives you precise climate control, lower energy costs, and flexible installation—ideal for large homes, open floorplans, workshops, or commercial zones.

🤔 What is BTU and TON in HVAC?

BTU (British Thermal Unit) measures how much heat an air conditioner or heat pump can move in one hour. A higher BTU rating means a more powerful system for larger spaces.

TON is the HVAC unit of measurement that expresses cooling capacity in terms of BTU/hr. One ton equals 12,000 BTU/hr.

BTU to TON Conversion Chart
BTU/hr TON
6,000 0.5
12,000 1.0
18,000 1.5
24,000 2.0
30,000 2.5
36,000 3.0
42,000 3.5
48,000 4.0
54,000 4.5
60,000 5.0

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FAQ – 42,000 BTU (3.5 Ton) Ductless Mini Splits

What size area does a 42,000 BTU (3.5 ton) mini split cover?

Typically 1,750–2,300 sq ft, depending on insulation, layout, and climate. Great for multi-room setups, workshops, or large great rooms.

How much does a 3.5 ton ductless system cost?

Equipment: $3,000–$8,000. Installed: $5,500–$13,000 depending on zones and labor.

What electrical setup is required for a 42k BTU unit?

Most require 208–230V, a dedicated 240V circuit, 38–60A breaker, and #8–#10 AWG copper wiring depending on run length.

How do I size breaker and wire gauge correctly?

Per NEC: units 36k–42k typically need a 30–40A breaker (240V) with #10–#8 AWG copper. Always confirm with manufacturer specs.

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