What size space does a 42 k BTU (3.5 ton) mini‑split cover?

A 42,000 BTU (3.5‑ton) outdoor unit typically cools or heats around 1,750–2,300 sq ft, depending on insulation, orientation, and climate...

What is the installed cost for a 3.5‑ton ductless mini‑split?

For 3.5‑ton systems, equipment alone ranges from $3,000–$8,000; installation adds another $2,000–$5,000, bringing total to approximately $5,500–$13,000.

Are 42 k BTU units suitable for DIY installation?

Some 42 k BTU units come pre-charged and support “DIY‑friendly” setups—but due to the size, these are better left to experienced installers.

Which brands and models are best for 3.5‑ton systems?

Great options include Trane's RunTru 42 k BTU (19 SEER2)...; LG’s 42 k BTU outdoor supports 3–5 indoor heads at 21.5 SEER2; and Mitsubishi/Fujitsu offer premium reliability.

42,000 BTU/ 3.5 TON

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2 zone 42,000 BTU BRAVO Ductless Mini Split AC Ceiling Cassette 18k+24k

Product Overview Brand: BRAVO Product Dimensions: 48"D x 40"W x 40"H Seasonal Energy Efficiency Ratio (SEER): 24.0 Color: White Voltage: 230 Volts (AC) Power Source: Corded Electric Controller Type: Remote...

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3 zone 42,000 BTU BRAVO Ductless Mini Split AC Wall Mounted 12k+12k+24k

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3 zone 42,000 BTU BRAVO Ductless Mini Split AC Wall Mounted 12k+18k+18k

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3 zone 42,000 BTU BRAVO Ductless Mini Split AC Wall Mounted 9k+12k+18k

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3 zone 42,000 BTU BRAVO Ductless Mini Split AC Wall Mounted 9k+12k+24k

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3 zone 42,000 BTU BRAVO Ductless Mini Split AC Wall Mounted 9k+9k+24k

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4 zone 42,000 BTU BRAVO Ductless Mini Split AC Wall Mounted 9k+9k+12k+12k

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4 zone 42,000 BTU BRAVO Ductless Mini Split AC Wall Mounted 9k+9k+12k+18k

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4 zone 42,000 BTU BRAVO Ductless Mini Split AC Wall Mounted 9k+9k+9k+12k

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4 zone 42,000 BTU BRAVO Ductless Mini Split AC Wall Mounted 9k+9k+9k+18k

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4 Zone 42,000 BTU OLMO Series Ductless Mini Split AC Wall Mounted 12k+12k+12k+12k

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White multi-zone mini split A/C and heater with 25ft installation kit for C&H comfort

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4 Zone 42,000 BTU OLMO Series Ductless Mini Split AC Wall Mounted 12k+12k+12k+18k

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4 Zone 42,000 BTU OLMO Series Ductless Mini Split AC Wall Mounted 9k+12k+12k+18k

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4 Zone 42,000 BTU OLMO Series Ductless Mini Split AC Wall Mounted 9k+9k+12k+12k

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4 Zone 42,000 BTU OLMO Series Ductless Mini Split AC Wall Mounted 9k+9k+9k+24k

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4 Zone 42,000 BTU OLMO Series Ductless Mini Split AC Wall Mounted 9k+9k+9k+9k

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5 zone 42,000 BTU BRAVO Ductless Mini Split AC Wall Mounted 9k+9k+9k+9k+12k

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5 Zone 42,000 BTU OLMO series Ductless Mini Split AC Wall Mounted 9k+9k+9k+12k+12k

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5 Zone 42,000 BTU OLMO Series Ductless Mini Split AC Wall Mounted 9k+9k+9k+9k+18k

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BRAVO 42,000 BTU Dual Zone 18000 + 24000 BTU Concealed Duct Mini Split A/C and Heater with 16ft Installation Kits

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BRAVO 42,000 BTU Dual Zone 24000 + 24000 BTU Concealed Duct Mini Split A/C and Heater with 25ft Installation Kits

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OLMO 42,000 BTU Tri Zone 12000 + 12000 + 18000 BTU Wall Mount Ductless Mini Split A/C and Heater with 25ft Installation Kits

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OLMO 42,000 BTU Tri Zone 12000 + 18000 + 18000 BTU Wall Mount Ductless Mini Split A/C and Heater with 25ft Installation Kits

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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

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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42,000 BTU/ 3.5 TON

2 zone 42,000 BTU BRAVO Ductless Mini Split AC Ceiling Cassette 18k+24k

2 zone 42,000 BTU BRAVO Ductless Mini Split AC Ceiling Cassette 24k+24k

2 zone 42,000 BTU BRAVO Ductless Mini Split AC Wall Mounted 18k+24k

2 zone 42,000 BTU BRAVO Ductless Mini Split AC Wall Mounted 24k+24k

3 zone 42,000 BTU BRAVO Ductless Mini Split AC Wall Mounted 12k+12k+18k

3 zone 42,000 BTU BRAVO Ductless Mini Split AC Wall Mounted 12k+12k+24k

3 zone 42,000 BTU BRAVO Ductless Mini Split AC Wall Mounted 12k+18k+18k

3 zone 42,000 BTU BRAVO Ductless Mini Split AC Wall Mounted 9k+12k+18k

3 zone 42,000 BTU BRAVO Ductless Mini Split AC Wall Mounted 9k+12k+24k

3 zone 42,000 BTU BRAVO Ductless Mini Split AC Wall Mounted 9k+9k+24k

4 zone 42,000 BTU BRAVO Ductless Mini Split AC Wall Mounted 12k+12k+12k+12k

4 zone 42,000 BTU BRAVO Ductless Mini Split AC Wall Mounted 9k+12k+12k+12k

4 zone 42,000 BTU BRAVO Ductless Mini Split AC Wall Mounted 9k+9k+12k+12k

4 zone 42,000 BTU BRAVO Ductless Mini Split AC Wall Mounted 9k+9k+12k+18k

4 zone 42,000 BTU BRAVO Ductless Mini Split AC Wall Mounted 9k+9k+9k+12k

4 zone 42,000 BTU BRAVO Ductless Mini Split AC Wall Mounted 9k+9k+9k+18k

4 Zone 42,000 BTU OLMO Series Ductless Mini Split AC Wall Mounted 12k+12k+12k+12k

4 Zone 42,000 BTU OLMO Series Ductless Mini Split AC Wall Mounted 12k+12k+12k+18k

4 Zone 42,000 BTU OLMO Series Ductless Mini Split AC Wall Mounted 9k+12k+12k+18k

4 Zone 42,000 BTU OLMO Series Ductless Mini Split AC Wall Mounted 9k+9k+12k+12k

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4 Zone 42,000 BTU OLMO Series Ductless Mini Split AC Wall Mounted 9k+9k+9k+24k

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5 zone 42,000 BTU BRAVO Ductless Mini Split AC Wall Mounted 9k+9k+9k+9k+12k

5 zone 42,000 BTU BRAVO Ductless Mini Split AC Wall Mounted 9k+9k+9k+9k+9k

5 Zone 42,000 BTU OLMO series Ductless Mini Split AC Wall Mounted 9k+9k+9k+12k+12k

5 Zone 42,000 BTU OLMO Series Ductless Mini Split AC Wall Mounted 9k+9k+9k+9k+18k

5 Zone 42,000 BTU OLMO Series Ductless Mini Split AC Wall Mounted 9k+9k+9k+9k+9k

BRAVO 42,000 BTU Dual Zone 18000 + 24000 BTU Concealed Duct Mini Split A/C and Heater with 16ft Installation Kits

BRAVO 42,000 BTU Dual Zone 24000 + 24000 BTU Concealed Duct Mini Split A/C and Heater with 25ft Installation Kits

OLMO 42,000 BTU Tri Zone 12000 + 12000 + 18000 BTU Wall Mount Ductless Mini Split A/C and Heater with 25ft Installation Kits

OLMO 42,000 BTU Tri Zone 12000 + 18000 + 18000 BTU Wall Mount Ductless Mini Split A/C and Heater with 25ft Installation Kits

OLMO 42,000 BTU Tri Zone 9000 + 18000 + 18000 BTU Wall Mount Ductless Mini Split A/C and Heater with 25ft Installation Kits

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

🤔 What is BTU and TON in HVAC?

🎯 Limited-Time Deals on 3.5 Ton Mini Split Systems

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

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