DIY Mini‑Split Install: TOSOT vs Mr Cool vs Della

Need to add heating and cooling to a garage, barn, or enclosed porch? In this video, I install a DIY ductless mini-split heat pump in my three-season room for year-round comfort. I compare three popular DIY mini split options — MrCool, Della, and TOSOT — and explain why I chose an 18,000 BTU TOSOT system with a built-in Energy Recovery Ventilator (ERV) for fresh air exchange. Watch for a step-by-step DIY mini split installation guide with pro tips on mounting the indoor unit, drilling through the wall for refrigerant lines and ERV vents, wiring the system, vacuuming the lines, and releasing refrigerant. This project resulted in a clean, professional-looking install (no sloppy coils or ugly line sets!) and cost about $2,200 total. If you're considering a DIY mini split installation for your home improvement project, this video will show you how to do it right — efficiently and safely — while boosting your property value with improved HVAC comfort. 👉 Use code HOMEPROHERO for 10% off any TOSOT product: https://tosotdirect.com/?dt_id=2629394 🔵 Tools & Products: 🔹 TOSOT Mini Split → https://tosotdirect.com/HOMEPROHERO 🔹 Huepar 24" Digital Level → https://amzn.to/4mnKYD7 🔹 DEWALT 20V Cordless Compact → https://amzn.to/4dAsUTU 🔹 Mini Split Pad → https://amzn.to/4voQzNm 🔹 Spyder 18-Piece Hole Saw Kit → https://amzn.to/4cdgH5e 🔹 DEWALT 20V MAX Hammer Drill Driver → https://amzn.to/4mt2NAO 🔹 Century Drill Lazer Spade Bit → https://amzn.to/3QxXpQE 🔹 DEWALT 20V MAX Shop Vacuum → https://amzn.to/47WAh4l 🔹 ToughBuilt 8-Piece Screwdriver Set → https://amzn.to/4sqHW2g 🔹 ToughBuilt Autoloading Utility Knife → https://amzn.to/48pF3HK 🔹 SURAIELEC 60 Amp Non-Fused AC Disconnect Box → https://amzn.to/4mnTS3h 🔹 DEWALT Safety Glasses → https://amzn.to/4t2SyoZ 🔹 4M Copper Tubing Pipe Extension → https://amzn.to/4vj6g93 🔹 Nylog Gasket & Thread Sealant → https://amzn.to/41XIKRl 🔹 Vacuum Pump → https://collabs.shop/e7rfpw 🔹 Zoizocp R410A Adapter → https://amzn.to/41Yw24L 🔹 Klein Tools NCVT1P Voltage Tester → https://amzn.to/4snAO6D 🔹 ThermoMaven Digital Thermometer → https://amzn.to/4mt4a2q 🔹 LyPrem 10 Ft Mini Split Line Set Cover 3" → https://amzn.to/4u05i03 🔹 DEWALT 12" Double-Bevel Compound Miter Saw → https://amzn.to/3OyrgrJ 🔹 DEWALT DCN680B 20V 18GA Brad Nailer → https://amzn.to/47XJdXk 🔹 Great Stuff Gaps & Cracks → https://amzn.to/4cmlnWA 🔹 Cable Zip Ties 400 Pack → https://amzn.to/48Eg6IC 🔹 WORKPRO Caulking Gun → https://amzn.to/3Q439BF 📝 DIY Plans: https://homeprohero.etsy.com FOLLOW ME 📸 📸 Instagram: https://www.instagram.com/homeprohero ▶️ YouTube: https://www.youtube.com/@UCmPc7lvTIm-J9GmvQku5wAw 📘 Facebook: https://www.facebook.com/homeprohero 🎵 TikTok: https://www.tiktok.com/@homepro.hero 🛒 Etsy: https://www.etsy.com/shop/HomeProHero 🌐 Website: https://www.homeprohero.net Disclaimer: Some of the links in this description are affiliate links. If you make a purchase through these links, I may receive a small commission at no additional cost to you. This helps support the channel and allows me to continue to make videos like this. Thank you for your support! ⏱️ VIDEO TIMESTAMPS: 00:00 Introduction – Why Add Heating & Cooling to a 3-Season Room 00:36 Three-Season Room Problems (Need for Climate Control) 01:01 Comparing DIY Mini Split Brands (MrCool vs Della) 01:44 Choosing the TOSOT Mini Split with ERV (High SEER & Fresh Air) 02:09 Installation Planning & Indoor Unit Placement 03:10 Mounting the Indoor Unit Bracket & Line Set Hole 04:57 Drilling ERV Ventilation Holes in Wall 06:24 Wiring the Indoor Air Handler (Electrical Connections) 07:20 Running the Refrigerant Line Set (First Attempt) 08:02 Kinked Line Set Mistake & Fix (Replacing Line) 08:21 Placing the Outdoor Condenser on a Pad 09:37 Bending Copper Lines Without Kinks (Spring Inserts) 11:05 Connecting Refrigerant Lines to the Indoor Unit 12:19 Hanging the Air Handler & Attaching ERV Module 13:10 Hooking Up Outdoor Unit Wiring 13:34 Connecting Refrigerant Lines at the Condenser 14:08 Vacuuming the Line Set (Evacuating Air) 14:49 Installing the ERV Ducts & Outside Covers 15:49 Vacuum Leak Test – Holding Pressure 16:06 Releasing Refrigerant into the System 16:26 Powering On and Test Run (Moment of Truth) 17:08 Building a Custom Line Cover (Wood Trim Finish) 18:22 Results & Cost Breakdown (2-Week Review) #minisplit #diyminisplit #ductlessheatpump #TOSOT #MrCool #minisplitinstall #garagehvac #3seasonroom #homeprohero #DIY