ColdSnapHeat helps you size and compare DIY ductless mini-split heat pumps: a BTU sizing calculator, a running-cost calculator, and manufacturer-sourced specs with the math shown.https://coldsnapheat.com/en-ushttps://coldsnapheat.com/articles/mini-split-heating-capacity-at-5f/https://coldsnapheat.com/articles/mini-split-heating-capacity-at-5f/A 12,000 BTU mini-split doesn't make 12,000 BTU of heat on a 5°F night. Here's what MRCOOL's own performance tables show, size by size, and how to plan for it.Mon, 19 Oct 2026 00:00:00 GMTCold-Climate Performancecold climate heat pump5 degree capacitylow ambientMRCOOL DIYhttps://coldsnapheat.com/articles/mrcool-diy-vs-pioneer-vs-senville-12k/https://coldsnapheat.com/articles/mrcool-diy-vs-pioneer-vs-senville-12k/Three popular 12,000 BTU mini-splits compared from their official spec sheets: efficiency, cold-weather ratings, voltage, price, and which one is actually DIY.Mon, 19 Oct 2026 00:00:00 GMTSpec ComparisonsMRCOOL DIYPioneer Diamante ProSenville AURA12000 BTU mini-splithttps://coldsnapheat.com/articles/what-size-mini-split-do-i-need/https://coldsnapheat.com/articles/what-size-mini-split-do-i-need/ENERGY STAR's BTU-per-square-foot chart for cooling, a climate-zone rule of thumb for heating, worked examples, and why the 5°F number matters.Mon, 19 Oct 2026 00:00:00 GMTSizing Guidesmini-split sizingBTU calculatorclimate zoneheat pump