Installing an air conditioner can be a big job. Some installs are simple. Some are hard and need a pro. This guide lists the tools you may need. It also tells you what you should never do alone. Safety matters. If you are not sure, call Malik Heating and Cooling.
Safety and rules first
Working on HVAC can be dangerous. Electrical work can shock you. Refrigerant is regulated. In the U.S., only people with EPA 608 certification may handle refrigerant. Cutting walls and roofing can be risky. Always wear safety gear. If a job needs wiring, brazing, or refrigerant work, hire a licensed tech.
Tools every DIYer should own (basic kit)
These are safe, common tools for many home jobs:
- Tape measure.
- Cordless drill and driver bits.
- Level.
- Phillips and flat screwdrivers.
- Adjustable wrench and pliers.
- Utility knife.
- Hammer.
- Stud finder.
- Safety glasses, gloves, and dust mask.
These tools help with prep, brackets, and basic fasteners.
Window AC: tools for a simple DIY install
Window units are the easiest to install yourself. Tools you will need:
- Tape measure and level.
- Screwdrivers (Philips + flat).
- Drill with wood/metal bits (for brackets).
- Socket set or wrench for mounting bolts.
- Caulk and caulk gun to seal gaps.
- Extra weather stripping or foam to seal the sash.
- Ladder or step stool for safe window work.
Most window ACs come with a mounting kit. Read the manual first.
Portable AC: what to have on hand
Portable ACs mostly need simple setup tools:
- Window vent kit (usually included).
- Screwdriver to fit the kit.
- Utility knife to trim the vent foam.
- Towels to catch drips.
Portable units plug into a normal outlet. They need a clear window and flat floor space.
Through-the-wall AC: small contractor tools
Through-the-wall units need a sleeve in the wall. If a sleeve already exists, swap-in is easy. If you must cut a new hole, work gets harder. Tools for this job:
- Tape measure and level.
- Drill and masonry bits for brick or block walls.
- Reciprocating saw or circular saw for wood framing.
- Hole saw or core drill for piping and wiring holes.
- Shims, sealant, and flashing for a weather tight fit.
Cutting a hole in a load-bearing wall or brick may need a pro and a permit.
Ductless mini-split: what DIYers should know
Mini-splits have an indoor head and an outdoor unit. They need a small hole for the refrigerant lines and wiring. Many people try DIY, but full hook-up is advanced. Tools often used by pros include:
- Drill and long hole saw (for line set hole).
- Level and template for mounting the indoor bracket.
- Tubing cutters and flaring tools (for copper lines).
- Vacuum pump and manifold gauge set (for evacuating and charging refrigerant).
- Brazing torch and nitrogen for soldering lines (pro skill).
If you do the bracket and wiring prep, stop before refrigerant work. Call a licensed HVAC tech for line brazing, vacuum, and charge.
Central AC: pro-level tools (usually not DIY)
Central systems link to ductwork and have a large outdoor condenser. These installs need heavy tools and licenses:
- Large gauges, vacuum pump, and refrigerant scales.
- Air handler and condenser rigging gear.
- Ductwork tools: sheet metal shear, crimper, and seamers.
- High-power drills and heavy lifts.
- Electrical testing gear and possibly a licensed electrician.
Central installs are complex. For safety and code, hire a contractor.
Electrical and wiring tools (if you are qualified)
If you are a trained DIYer handling low-risk wiring, these tools help:
- Multimeter for voltage checks.
- Wire strippers and crimpers.
- Screwdrivers and nut drivers for disconnects.
- Conduit and proper-rated cable.
Only do electrical work if you know local code and you are comfortable. A wrong wire can start a fire.
Safety gear and helpers
Always use safety gear:
- Safety glasses and gloves.
- Hearing protection for power tools.
- Ladder that is rated and stable.
- Work boots with grip.
Also have a helper for heavy lifts. Outdoor condensers and through-the-wall units are heavy. Two people reduce risk.
Consumables and small supplies
You will need parts and supplies like:
- Silicone caulk and weather seal.
- Mounting bolts, washers, and anchors.
- Electrical tape and wire nuts.
- Insulation tape for line sets.
- Thread seal tape for fittings.
Buy the right fasteners for your wall type (wood, masonry, or metal).
What you should NOT do as a DIYer
Do not try to:
- Handle refrigerant without EPA 608 certification.
- Braze or solder refrigerant lines unless trained and safe.
- Rewire the main service panel without an electrician.
- Install or alter pressure vessels or gas lines.
If you face these tasks, stop and call a licensed pro.
Tips to prepare and save time
- Read the manual fully before you buy tools.
- Premeasure the space and power needs.
- Turn power off before touching wires.
- Have the unit and tools staged near the install spot.
- Take photos of wiring and setup before you disconnect things.
This makes work smoother and safer.
When to call Malik Heating and Cooling
If you feel unsure, call us. Malik Heating and Cooling can do the hard parts. We can also help with permits and code needs. A pro will save time and protect your warranty. We do safe, licensed installs and we clean up after the job.
Final words
Some AC installs are fine for handy homeowners. Window and portable units are the easiest. Through-the-wall, mini-split, and central systems often need pro tools and licenses. Use the right tools. Use safety gear. Know when to stop. If the job goes beyond simple mounting or fasteners, get a licensed HVAC tech. Your home and your family are worth the call.