How to Install AC in Garage: Easy DIY Cooling Guide

Keeping your garage cool can make a huge difference, especially during hot summer months. Whether you use your garage as a workshop, gym, or extra living space, installing an AC unit can boost comfort and usability. You don’t have to settle for sweltering heat or expensive professional help to get the job done.

With the right tools and a clear plan, you can install an air conditioner in your garage yourself. From choosing the best type of AC to handling electrical connections safely, this guide walks you through the essential steps. Get ready to transform your garage into a cool and comfortable space you’ll actually want to spend time in.

Choosing the Right AC Unit for Your Garage

Selecting an AC unit designed for garage spaces ensures efficient cooling and energy use. The following details help identify the best option for your needs.

Types of AC Units Suitable for Garages

  • Window AC Units: Easy to install in standard garage windows, these units offer adequate cooling for small to medium-sized garages.
  • Portable AC Units: Flexible placement options without permanent installation, ideal if window installation isn’t possible.
  • Ductless Mini-Split Systems: Provide efficient cooling without ductwork. Suitable for larger garages and spaces converted into living areas.
  • Through-the-Wall AC Units: Installed directly through an exterior wall, offering a stable cooling solution without occupying window space.

Factors to Consider Before Purchasing

  • Garage Size: Measure the square footage to determine the required BTU (British Thermal Unit) capacity; larger spaces need units with higher BTUs.
  • Insulation Quality: Evaluate insulation, as poorly insulated garages require more powerful AC units for effective cooling.
  • Power Supply: Confirm your garage’s electrical capacity matches the unit’s voltage and amperage requirements to avoid overloads.
  • Ventilation Needs: Consider ventilation for portable and window units to manage humidity and air circulation properly.
  • Budget and Energy Efficiency: Factor initial cost and operating expenses. Look for ENERGY STAR-certified models to reduce energy consumption and utility bills.

Preparing Your Garage for AC Installation

Preparing your garage properly ensures a smooth AC installation and optimal cooling performance. Focus on electrical needs, space measurements, and the best placement to maximize efficiency.

Assessing Electrical Requirements

Start by checking your garage’s electrical capacity. Confirm the circuit breaker can handle the AC unit’s amperage, especially for window or mini-split systems that demand 15 to 30 amps. Use a dedicated circuit if possible, reducing overload risks. Inspect outlets and wiring for damage or outdated components. If your garage lacks sufficient power, consider upgrading the electrical panel or hiring an electrician to install new outlets with the correct voltage and amperage ratings.

Measuring Space and Placement Options

Measure your garage’s length, width, and height to calculate total cubic footage, a vital factor in choosing an AC unit with adequate BTU capacity. Identify potential installation spots like windows, wall space, or areas near power sources. For window units, confirm window dimensions and clearance. For wall or mini-split systems, find a location with minimal obstructions and proper airflow. Avoid placing the unit near heat sources, doors, or vents to ensure consistent temperature control and efficiency.

Step-by-Step Guide to Installing AC in Your Garage

Follow a clear, structured process to install your garage AC unit safely and efficiently. This section covers the tools, materials, and specific installation steps for different types of AC units.

Tools and Materials Needed

Prepare the following tools and materials before starting your installation:

  • Power drill with drill bits, for mounting and creating holes
  • Screwdrivers (Phillips and flathead), for securing brackets and panels
  • Measuring tape, to ensure precise placement and fit
  • Level, to keep the AC unit straight and balanced
  • Weatherproof sealant or foam insulation, for sealing gaps around the unit
  • Electrical tester, to verify power circuits and connections
  • Mounting brackets or window kit, supplied with the AC or purchased separately
  • Extension cord with proper amperage rating (only temporary use for portable units)
  • Safety gear, including gloves and safety glasses

Installing a Window or Wall-Mounted AC Unit

Install your window or wall-mounted unit by completing these steps precisely:

  1. Measure and prepare the installation site. For a window unit, clear the window sash and frame. For a wall-mounted unit, cut an opening according to the unit’s dimensions, ensuring it fits tightly.
  2. Mount the support brackets following the manufacturer’s instructions. Use a level to ensure the unit will be balanced.
  3. Insert the AC unit into the opening. Secure it to the brackets or window frame with screws. Confirm the unit tilts slightly outward for condensation drainage.
  4. Seal gaps around the unit with weatherproof sealant or insulated foam to prevent air leaks and moisture intrusion.
  5. Connect the unit to power. Plug into a dedicated circuit if possible, avoiding extension cords. Use an electrical tester to verify appropriate voltage and amperage.
  6. Test the unit by turning it on and checking for proper airflow and cooling performance.

Setting Up a Portable AC Unit

For portable AC units, follow these clear steps to ensure efficient operation:

  1. Choose placement near a window or vent to allow proper exhaust hose installation.
  2. Attach the exhaust hose to the unit and secure the other end to a window kit, sealing all gaps firmly.
  3. Plug the unit into a dedicated outlet with the correct voltage and amperage rating. Avoid extension cords for long-term use.
  4. Install the drainage setup following the manufacturer’s guidelines either by using a collected water tank or hose drainage.
  5. Switch on the unit and adjust settings to maintain your desired garage temperature.

Installing a Ductless Mini-Split System

  1. Mount the indoor unit on a structurally sound wall inside the garage, ideally high on the wall away from heat sources and obstructions.
  2. Install the outdoor condenser unit on a flat, stable surface outside with at least 24 inches of clearance on all sides for airflow.
  3. Connect refrigerant and electrical lines between indoor and outdoor units, ensuring all connections are tight and leak-free.
  4. Install the drain line to prevent water buildup inside the indoor unit. Run the line outside following local codes.
  5. Power the system by connecting to a dedicated circuit breaker and grounding properly.
  6. Test the mini-split system to confirm cooling efficiency and system responsiveness before sealing all access panels.

Maintaining Your Garage AC to Ensure Longevity

Proper maintenance keeps your garage AC running efficiently and extends its lifespan. Regular care prevents costly repairs and ensures consistent cooling.

Cleaning and Filter Replacement Tips

Clean AC components every 1 to 3 months, depending on usage and environment. Wash or replace filters regularly to maintain airflow and remove dust, pollen, and debris. Use a vacuum with a brush attachment or rinse filters with water, allowing them to dry completely before reinstalling. Clean the evaporator and condenser coils yearly to prevent dirt buildup. Keep vents and registers clear of obstructions to ensure optimal air distribution.

Seasonal Maintenance Checklist

Inspect the AC unit before each cooling season to identify and address issues early. Check electrical connections and tighten loose wires. Inspect the insulation on refrigerant lines and repair if damaged. Examine the drain line for clogs to avoid water damage or mold growth. Test the thermostat for accuracy and recalibrate if necessary. Lubricate fan motors and moving parts according to the manufacturer’s instructions. Schedule professional servicing every 1 to 2 years if you want thorough system checks beyond routine tasks.

Conclusion

Installing an AC in your garage can transform the space into a comfortable and functional area year-round. With the right planning and careful installation, you can enjoy efficient cooling without breaking the bank or relying on professionals.

By choosing the appropriate unit and maintaining it regularly, you’ll keep your garage cool and energy-efficient for years to come. Taking control of your garage’s climate means you can make the most of the space however you want.

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