A Guide to Replacing a Window Unit A/C With a Mini Split

Older homes have their charm, from timeless architecture to unique characteristics. However, many of them also come with outdated and energy-inefficient appliances. One common feature in older homes is window-unit air conditioners.

While these units may provide some relief during hot summer days, they’re far from ideal when it comes to energy efficiency, noise levels, and overall effectiveness. If you’re a homeowner with a window A/C unit, it may be time to consider upgrading to a mini-split system.

Mini-split air-conditioning systems are highly efficient and offer several benefits that make them a worthwhile investment. If you’ve been contemplating upgrading your window unit, this guide to replacing your window A/C with a mini split is essential.

Why Upgrade to a Mini-Split System?

Before jumping into the replacement process, it’s important to understand why mini-split systems are such excellent technology for cooling (and heating) your home. Here are some key benefits.

Energy Efficiency

Mini-split systems are designed to use far less energy than traditional window units. With inverter technology, mini splits can adjust their output to meet the demands of the room, unlike window units that often run at full capacity regardless of the need. This energy efficiency reduces your utility bills in the long run.

Whisper-Quiet Operation

Window units are notorious for their noise levels, which can disrupt your sleep or quiet indoor activities. Mini-split systems, on the other hand, operate at much quieter levels because most of the noise-generating components are located outside.

Zoned Comfort

Mini-split systems can cool specific “zones” or rooms in your home. This targeted cooling eliminates the need to cool the entire home when you only need temperature control in a particular area, like your bedroom or living room.

Preserve Your View and Aesthetics

Window units take up valuable window space, blocking the view and reducing natural light. Mini splits are mounted to the wall or ceiling, freeing up your windows and improving your home’s interior and exterior appearance.

Dual Heating and Cooling Capabilities

Many mini-split systems offer heating and cooling, providing year-round climate control. This feature makes mini splits a versatile solution for homeowners, especially in regions with varying temperatures.

How To Replace Your Window Unit A/C With a Mini Split

Replacing your window unit A/C with a mini-split system involves preparation and professional help. Here’s a step-by-step guide to make the transition smoother.

Step 1: Assess Your Home’s Cooling Needs

Before jumping into the installation process, you must first understand what your home needs in terms of cooling and heating. Consider the following:

• Room size: Measure the square footage of the room or area where the mini-split system will be installed. This information helps you determine the system’s cooling capacity, which is often measured in British thermal units (BTUs). A contractor can assist in calculating the appropriate system sizing.
• Number of zones needed: Decide if you need a single-zone or multi-zone mini-split system. A single-zone system is sufficient for one room, but if you’re looking to replace multiple window units in different rooms, a multi-zone system may be required.
• Climate needs: If you want the system to provide cooling and heating, look for a mini split with a heat pump function.

Step 2: Remove the Window A/C

Once you’ve decided to move forward with a mini split upgrade, the next step is removing the window unit. Follow these tips:

• Prioritize safety: Unplug the unit before handling it, and, if possible, have someone assist you during removal, especially if the window unit is particularly heavy.
• Inspect the window: Once you’ve removed the unit, check the window and surrounding frame for damage or wear. Old window A/C units can sometimes cause drafts or structural issues.
• Seal openings: If the window is no longer being used for ventilation, seal it properly with weatherproof materials to maintain insulation.

Step 3: Choose the Right Mini-Split System

Now, it’s time to select the perfect mini-split system for your home. Look for the following features:

• High SEER rating: The Seasonal Energy Efficiency Ratio (SEER) measures the system’s efficiency. A higher SEER rating can lead to greater energy savings.
• Appropriate BTU rating: Choose a system with a BTU rating that matches your room size for optimal performance and efficiency.
• Brand reputation and warranty: Select reputable brands with extended warranties for peace of mind post-installation.

Step 4: Hire a Professional for Installation

Although some mini-split systems advertise DIY installation, hiring a licensed professional is highly recommended for most homeowners, especially for older homes with unique layouts.

A professional technician will install the indoor air-handling unit securely on a wall or ceiling, mount the outdoor condenser unit in an optimal location, and handle electrical wiring connections safely and securely. You can also count on the technician to check that refrigerant lines, drainage, and connections are properly installed for maximum efficiency.

Step 5: Test the System

Once installation is complete, have the technician test the system to confirm that it’s running smoothly. Check all zones (if you opted for a multi-zone model) to verify that the cooling and heating performance meets your expectations.

Maintaining Your New Mini-Split System

After successfully upgrading to a mini split, maintaining the system will ensure longevity and efficiency. Here are some maintenance tips:

1. Clean or replace filters regularly: The filters in the air-handling unit need cleaning or replacement every one to three months, depending on usage.
2. Inspect the outdoor unit: Check that the outdoor condenser remains free of debris, leaves, or dirt to maintain proper airflow.
3. Schedule professional tune-ups: Annual maintenance by a professional promotes consistent performance and identifies potential issues early.

Make the Move Today

Replacing your old window unit A/C with a mini-split system might feel like a big investment initially, but the benefits far outweigh the upfront costs. From energy savings to improved comfort and aesthetics, mini splits provide a much-needed upgrade for older homes.

By following this guide and working with trusted professionals, you’ll enjoy a quieter, more efficient, and comfortable living space for years to come. If you’re ready to make the switch but you don’t feel comfortable doing the replacement yourself, you can rely on W. F. Smith. Our professional mini split installers will happily take care of your needs. Contact us today to begin planning your installation.