Many older houses do not have a duct system, leaving homeowners wondering what to do when the sweltering heat hits. If you’re in a similar situation, you’re in luck — air ducts aren’t the only way to get cooled air to each room. Explore six options for installing AC for homes without ducts.
1. Mini-Split Systems
Mini-split systems comprise an outdoor compressor and multiple indoor air handlers with independent thermostats. This setup doesn't require existing ductwork because it processes the air in the room where it’s installed.
One of the most significant advantages of ductless mini-splits is their energy efficiency. According to the Department of Energy, these systems can be up to 30% more efficient than traditional AC units. They also enable zoned air-conditioning, allowing household occupants to control the cooling level in each room for personalized comfort.
2. Window Air Conditioners
Window AC units are a classic solution for homes lacking ductwork. They’re generally cheaper and easier to install than conventional HVAC systems. These appliances are highly effective for small spaces and often use less power than central air systems, which can help lower electricity bills.
In the past, window ACs have been criticized for their energy consumption, but newer inverter models put those worries to rest. Another concern is some homeowners may find these units less visually appealing, as they can obstruct views and alter the aesthetics of a room. Regardless, they remain a reliable option if you need efficient cooling solutions in an older home.
3. High-Velocity HVAC
High-velocity systems deliver conditioned air through small, flexible ducts, making them suitable for homes without existing ductwork. One of the primary advantages of these systems is their space-saving design. The smaller ducts can be discreetly run through walls, minimizing the impact on your home’s aesthetics.
Given the intricacy of the installation, it’s often best to consult a professional before proceeding with the project. Experts recommend measuring your living area’s square footage to determine the right high-velocity system. Other considerations include the room’s layout, number of windows and age of the cooling unit.
4. Portable Air Conditioners
Installing a portable AC for homes without ducts presents a practical, flexible solution. The unit can be moved from room to room, making it ideal for cooling specific areas.
While these systems offer mobility and a lower price point, they have limitations. For one, they may not be suitable for larger spaces, and you must place them near a window to vent hot air. Plus, they have a drip pan that collects condensation, which you have to drain out the drip pan frequently to prevent leaks.
5. Geothermal Cooling
Geothermal systems utilize the stable temperatures below the earth’s surface to deliver conditioned air. They absorb heat from your home and circulate fluid through underground pipes, providing a consistent and reliable cooling source.
The Department of Energy rates these systems highly, especially as a viable solution for decarbonizing buildings and reducing the need for new grid transmission. Geothermal pumps can minimize power usage and carbon emissions by up to 72% compared to conventional AC equipment. They’re currently available across all 50 states, though the upfront installation costs remain a concern.
6. Swamp Coolers
Swamp coolers draw in warm air through water-saturated pads, cooling the air through evaporation before circulating it throughout the home. In rooms that need to be cooler than others, you can open a window slightly to let the warmer air escape, allowing the cool air to permeate the space.
The most significant benefit of these systems is their low energy consumption. Studies show evaporative coolers can be up to four times more efficient than traditional AC units, saving you money on your bill. However, they’re most effective in low-humidity environments. They also require constant water supply and maintenance to keep the pads functioning correctly.
Don’t Skimp on Routine Maintenance
Whether you have an existing AC system or are installing a new HVAC system, regular upkeep is essential. Keeping up with maintenance helps extend the life of your system, ensuring your home stays cool and comfortable. It also allows you to identify and fix minor issues before they turn into costly repairs.
Experts suggest changing your air filter every few months to prevent clogs and maintain efficiency. Clogged filters can collect dust, hair, pollen, and pet dander, causing your system to work harder and wear out more quickly. Regular cleaning keeps your system running smoothly for longer.
Install the Best AC for Homes Without Ducts
Several viable heating and cooling options are available for homes without ductwork. From ductless mini-splits and window units to high-velocity systems and portable ACs, each option has unique advantages and considerations. Evaluate your home’s specific needs, budget and preferences before making a decision to ensure a comfortable living environment year-round.
