Ductless mini splits for less · 2026 buyer's guides & free sizing helpSize my system →
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Tools & Guides

Tools & Guides

Everything you need to size, install and look after a ductless mini split: the free BTU calculator, installation cost, the easiest DIY install, SEER2 explained, cold-weather performance, and maintenance. Looking for rankings and comparisons? See All Articles.

Latest

New guides

GuideAverage Life Span of a Mini Split: How Long Ductless Systems LastMini split average lifespan shrinks fast with poor installation and harsh climates - see which hidden factors waste your ductless system life expectancy

Tools

Interactive tools

ToolMini Split Sizing CalculatorEnter square footage, ceiling height and climate to get a BTU target in about a minute. ToolInstallation Cost EstimatorWorked cost examples for pro install vs DIY, by system size.

Guides

How-to guides and explainers

GuideDIY Install Concealed Duct Multi Zone Mini Split: MRCOOL & Zone AirPlan, prep, mount, wire and commission a hidden ducted multi-zone system with pre-charged quick-connect line sets, step by step. ToolHow to Size a Mini SplitInteractive BTU calculator plus the rules of thumb behind it. GuideMini Split Installation CostWhat pros charge, what DIY saves, and worked examples. GuideEasiest DIY Mini Split to InstallPre-charged quick-connect line sets vs flare-and-vacuum kits. GuideCeiling Cassette Mini Split DIY InstallationStep-by-step 4-way cassette install: ceiling opening, line sets, wiring and start-up. GuideEPA Refrigerant Certification for Mini SplitsSection 608, R-32 and R-454B, and why a pre-charged line set keeps a homeowner install legal in 2026. GuideSEER2 ExplainedWhat the 2026 efficiency rating means for your power bill. GuideDo Mini Splits Work in Cold Weather?How low a mini split can heat, and what to look for. GuideHow Long Do Mini Splits Last?Lifespan, maintenance and when to replace.

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