What Size of AC Unit Do I Buy for My Home?

Inland Empire Comfort
November 30, 2022

When you buy clothes, you take the time to ensure shirts, pants, and shoes fit. You should do the same thing for your home when buying an air conditioner. Knowing what size of AC unit your home needs is essential for achieving maximum efficiency and performance. 


Some homeowners believe that bigger is better, thinking that larger units can cool their homes quicker. Meanwhile, others believe that smaller units can save them money. However, in both situations, the homeowner ends up paying more over time. 


The best way to avoid unnecessary air conditioner repair in Claremont is by ensuring your AC unit is the right size for your home. Below, we review everything you need to know about sizing an air conditioner. 

 

Why Does the Size of Your Air Conditioner Matter?

Wearing clothes that are too big can make it difficult to walk around, while clothes that are too small are uncomfortable. Although you can get away with wearing either, you want to spend your money on clothes that are comfortable and fit perfectly. The same concept applies to your home's cooling system. 


If your home has an air conditioner that is too large, the system will likely require frequent repairs and extensive upkeep. Conversely, a unit that is too small will struggle to maintain adequate indoor temperatures, drawing more energy and increasing monthly utility costs. 


Finding the right size air conditioner for your home means having a more efficient system. As a result, you can enjoy lower energy bills, fewer repairs, and a more comfortable home. 

 

How to Calculate the Size You Need

The best way to determine what size of AC unit your home needs is to ask an expert. HVAC technicians can inspect your home and analyze your cooling needs to determine what size unit is best for your home. 


When calculating AC unit size on your own, the three most things to determine are your home's square footage, the ceiling height, and the required AC unit tonnage. Tonnage refers to a unit's ability to remove heat from the air in an hour. 


You can measure an AC unit's tonnage, or capacity, using British Thermal Units (BTUs). For example, the approximate energy needed to cool one square foot of space is 25 BTU. 


You can calculate an AC unit's tonnage using the following equation:

Air Conditioner Tonnage (tons) = (Home's square footage x 25 BTU) / 12,000 - 1


Calculating the tonnage can help you determine what size AC unit your home needs. For example, if your house has 1,200 square feet, you would use the following calculations:


(12,000 x 25) / 12,000 - 1 = 1.5 tons 

 

Factors to Consider When Buying a New AC Unit

Determining what size AC unit your home needs depends on more than a single calculation. When buying a new air conditioner, consider the following factors to ensure you get the most efficient system.


Efficiency Ratings

The best way to determine a unit's energy efficiency is by looking at the SEER rating. SEER (seasonal energy efficiency ratio) ratings compare the energy a system uses to cool and home to what it wastes. The higher the SEER rating, the more energy-efficient a unit is. 


For maximum efficiency and energy savings, look for units with an Energy Star® certification, which indicates that the unit consumes at least 8% less energy than other systems.


The Climate Around Your Home

Homes in different climates have varying cooling needs. For example, a house in Arizona needs more cooling than one in New York. If you run your air conditioner for most of the year, finding a unit with a high SEER rating is essential for saving money on energy costs and having a longer-lasting system.


Your Home's Windows

The type of windows your home has can contribute to an AC unit's efficiency. For instance, single-paned windows often lead to greater energy loss, putting a more significant strain on your HVAC system. Meanwhile, double- and triple-paned windows offer better energy efficiency, so you can get an AC unit with lower tonnage.

 

Call the Pros 

Instead of determining tonnage and load calculations on your own, let our technicians help you find the perfect size of AC unit for your home. Our experts at Inland Empire Comfort have years of experience working with HVAC systems in California; we know everything from calculating the right indoor unit size to identifying signs of toxic coolant leaks.


Call our team at (951) 336-8709 to schedule an inspection in Riverside, CA!

You might also like

Inland Empire Comfort

By SEOCH March 5, 2026
To improve indoor air quality in Riverside, CA, consider investing in high-quality air filters with a high MERV rating to effectively trap allergens. Regular professional check-ups on your HVAC system can help catch potential issues early, ensuring optimal performance. Utilizing air purifiers and dehumidifiers can significantly reduce dust and moisture levels, while maintaining proper ventilation through open windows and exhaust fans is crucial. Additionally, incorporating indoor plants can naturally filter toxins and enhance oxygen levels. For expert assistance and more tailored solutions, reach out to Inland Empire Comfort to discover additional ways to enhance your home's air quality! Invest in High-Quality Air Filters Investing in high-quality air filters is a crucial step toward enhancing your indoor air quality. These filters effectively trap dust, allergens, and pollutants, ensuring that cleaner air circulates throughout your home. By minimizing airborne contaminants, you not only protect your health but also foster a more comfortable living environment. Selecting the right filter can significantly impact your air quality. Look for options with a high MERV rating, as these are designed to capture smaller particles more effectively. Additionally, consider which type of filter best suits your needs, such as HEPA, pleated, or electrostatic. Regular replacement of these filters is essential; clogged filters can obstruct airflow and strain your HVAC system, leading to increased energy costs. Moreover, indoor air quality evaluation services can help identify specific contaminants in your home, allowing for tailored filter recommendations. By prioritizing high-quality air filters, you enhance your home's air quality, safeguard your family's health, and boost overall comfort. It's a straightforward yet impactful investment that pays dividends in the long run. For more information on air filters and HVAC solutions, you can explore options available through Inland Empire Comfort. Maintain Regular HVAC System Maintenance To ensure your indoor air quality remains optimal, regular HVAC system maintenance is essential. Schedule routine check-ups with a trusted HVAC professional to keep your system operating efficiently. Consistent maintenance helps identify potential issues before they escalate, ensuring smooth operation throughout the year. During these check-ups, technicians will clean components, check refrigerant levels, and inspect ducts for leaks or debris. This not only enhances your system's efficiency but also prevents dust and allergens from circulating in your home. It's crucial to seek emergency AC repair if your system shows signs of malfunction, as timely service can prevent further issues. It's also important to monitor your system's performance between maintenance visits. If you notice unusual noises or inconsistent temperatures, don't hesitate to call for service. Utilize Air Purifiers and Dehumidifiers Utilizing air purifiers and dehumidifiers can significantly enhance your indoor air quality, particularly in areas like Riverside, CA, where humidity and pollutants present challenges. Air purifiers effectively filter out allergens, dust, and harmful particles, leading to cleaner and healthier air. Opting for a purifier equipped with a HEPA filter allows you to capture even the smallest contaminants, thereby reducing the risk of respiratory issues. Conversely, dehumidifiers play a crucial role in controlling excess moisture in your home. High humidity levels can promote mold growth and dust mites, both detrimental to your health. By maintaining optimal humidity levels, dehumidifiers not only create a more comfortable living environment but also protect your home's structure. Regular AC maintenance is essential to ensure that your air conditioning system operates efficiently, which can further enhance your indoor air quality. Incorporating both air purifiers and dehumidifiers into your space can substantially improve your indoor air quality, ensuring a healthier atmosphere for you and your family. For tailored solutions, consider consulting with Inland Empire Comfort to find the right products for your needs. Ensure Proper Ventilation Ensuring proper ventilation is essential for maintaining healthy indoor air quality, especially in a climate like Riverside, CA. Good airflow helps to disperse indoor pollutants and prevents the buildup of moisture, which can lead to mold growth. To improve ventilation, start by opening windows and doors whenever it's safe and comfortable. This simple step allows fresh outdoor air to circulate inside your home. If you have a central HVAC system, make sure your vents are unobstructed and clean, promoting efficient air movement. Installing exhaust fans in high-moisture areas like kitchens and bathrooms can help remove stale air. Additionally, consider investing in a whole-house ventilation system that provides controlled air exchange throughout your home. By prioritizing proper ventilation, you can create a healthier living environment and enjoy the many benefits of fresh air, with assistance from experts who understand the local climate needs. For optimal performance, proper placement of air conditioning units can further enhance air quality by ensuring efficient airflow throughout your home. Incorporate Indoor Plants for Natural Air Filtration Incorporating indoor plants into your home not only adds a touch of greenery but also enhances air quality naturally. Plants like spider plants, peace lilies, and snake plants are known for their ability to filter toxins and release oxygen. By strategically placing these plants in your living spaces, you can reduce indoor pollutants, such as formaldehyde and benzene, creating a healthier environment for you and your family. Moreover, caring for plants can improve your mood and reduce stress. Studies show that being around greenery can increase your overall well-being. It's a good idea to choose a variety of plants to ensure a diverse air filtration system. Remember to give them proper light and water so they thrive. With a little effort, you'll enjoy not just the aesthetic appeal but also the clean, fresh air that indoor plants provide, significantly enriching your home's atmosphere. For those looking to enhance their indoor environment, Inland Empire Comfort offers valuable insights on maintaining a healthy home.
By SEOCH March 5, 2026
If you're noticing increased allergies, frequent sneezing, or coughing, it could be a sign of poor indoor air quality in your Corona, CA home. Unpleasant odors or stale air might indicate trapped pollutants and insufficient ventilation. Moreover, frequent dust accumulation and dirty HVAC filters are common red flags that suggest your air circulation needs attention. Being aware of these warning signs can improve your well-being. For further insights on how to guarantee a healthier indoor environment, consider reaching out for expert assistance. Increased Allergies and Respiratory Issues If you've noticed an increase in allergies or respiratory issues at home, it may indicate poor indoor air quality. Accumulations of dust, pollen, mold, and pet dander can trigger sneezing, coughing, or even asthma attacks, leading you to reach for tissues more often or struggle to breathe. It's crucial to evaluate your indoor environment. Are your air filters clean and changed regularly? Is there adequate ventilation in your home? Stale air can exacerbate allergy symptoms and make breathing uncomfortable. Addressing these concerns is essential for your well-being. Consider investing in air purifiers or an HVAC system designed to enhance air quality. Regular maintenance services can significantly improve indoor air quality and ensure your system runs efficiently. A professional can help you identify and resolve these issues, ensuring you breathe easier. Don't let poor air quality compromise your health—take action now for a fresher and safer living space. Unpleasant Odors and Stale Air Increased allergies and respiratory issues often go hand in hand with unpleasant odors and stale air. If you notice musty smells, lingering food odors, or an overall sense of heaviness in your home's atmosphere, it could signal poor indoor air quality. These odors aren't just annoying; they can indicate trapped pollutants, mold, or insufficient ventilation. Stale air often stems from a lack of airflow, which allows allergens and irritants to accumulate. You might find that opening windows doesn't help, as outdoor air could be just as polluted. Addressing these odors is vital for your health and comfort. It's essential to check your HVAC system to ensure it's functioning properly and improving air circulation. Regular maintenance of your AC can significantly enhance indoor air quality by preventing the buildup of contaminants. If you're still struggling with unpleasant smells, reaching out to a professional like Inland Empire Comfort can provide the necessary expertise and solutions to restore freshness to your indoor environment. Don't ignore these signs—your well-being depends on it! Frequent Dust Accumulation and Dirty HVAC Filters When you notice frequent dust accumulation in your home, it often points to dirty HVAC filters that need attention.  These filters play a crucial role in maintaining indoor air quality by trapping dust, allergens, and pollutants. If they're clogged or dirty, your HVAC system struggles to circulate air effectively, leading to more dust settling on surfaces. You might find yourself cleaning more often and still experiencing respiratory issues or allergy symptoms. To combat this, check your filters regularly and replace them as needed—every 1 to 3 months is a good rule of thumb. If you're uncertain about the condition of your HVAC system, consider reaching out to a professional service. They can provide a thorough inspection and ensure your system operates efficiently, improving your home's air quality while keeping your environment clean and comfortable. Expert air conditioner repair services can identify and resolve underlying issues contributing to poor indoor air quality.
By SEOCH January 5, 2026
To improve your indoor air quality before spring in Riverside, CA, start by regularly changing your air filters and increasing ventilation. Open windows and use exhaust fans to circulate fresh air throughout your home. Consider using air purifiers with HEPA filters to effectively trap allergens and pollutants. Keep humidity levels in check by using a hygrometer and a dehumidifier if necessary. Finally, schedule professional HVAC maintenance to ensure your system runs efficiently and optimally. For even more tips on achieving a healthier home, be sure to reach out for expert advice. Regularly Change Your Air Filters Although it might seem like a small task, regularly changing your air filters can greatly impact your indoor air quality. When you neglect this simple chore, dust, allergens, and pollutants accumulate, making it harder for your HVAC system to function efficiently. It's recommended to check your filters at least once a month, especially during peak usage seasons. If they're dirty, replace them immediately to keep your air clean and fresh. Using high-quality filters can also help trap more particles, further improving your home's air quality. Remember, a clean filter means better airflow, lower energy bills, and a longer lifespan for your HVAC system. Additionally, regular maintenance services can enhance the efficiency of your air quality management efforts. Consider setting reminders on your phone or calendar to ensure you stay on top of this crucial task. By making this small commitment, you're investing in a healthier living environment for you and your family, enhancing comfort and well-being at home with the help of Inland Empire Comfort. Increase Ventilation in Your Home Open Windows : When the weather permits, open your windows to let fresh air circulate. Use Exhaust Fans : Turn on kitchen and bathroom exhaust fans to remove excess moisture and odors. Install Air Vents : Ensure your home has adequate air vents, especially in enclosed spaces. Consider a Ventilation System : For those serious about air quality, exploring options from Inland Empire Comfort for a whole-home ventilation system can be beneficial. Regular maintenance checks, including furnace filter replacement , can also enhance indoor air quality by ensuring efficient operation. Use Air Purifiers to Reduce Pollutants Using air purifiers can greatly improve your home's air quality by removing harmful pollutants and allergens. These devices work by filtering out dust, pet dander, pollen, and even smoke particles, creating a healthier living environment for you and your family. When selecting an air purifier, look for models with HEPA filters, as they capture at least 99.97% of particles that are 0.3 microns or larger. Position your air purifier in high-traffic areas or rooms where you spend the most time, such as the living room or bedroom. Make sure to check the filter regularly and replace it as needed to maintain peak performance. Additionally, consider running your air purifier continuously, especially during allergy season or when air quality is poor. With consistent use, you'll notice a reduction in allergens, leading to improved comfort and well-being in your home. For recommendations and quality products, Inland Empire Comfort offers reliable solutions to enhance your indoor air quality, including expert advice on air conditioning servicing to ensure your system is functioning optimally. Keep Humidity Levels in Check Use a hygrometer to monitor indoor humidity levels, aiming for 30-50%. Invest in a dehumidifier if your home feels damp, especially in basements or bathrooms. Seal leaks and gaps in windows and doors to prevent outside moisture from entering. Ventilate your home by opening windows on dry days or using exhaust fans in kitchens and bathrooms. Additionally, maintaining proper humidity levels can help prevent issues like refrigerant leaks that lead to cooling difficulties. Schedule Professional HVAC Maintenance Maintaining balanced humidity levels in your home is just one aspect of ensuring a comfortable environment. To truly enhance your indoor air quality, scheduling professional HVAC maintenance is essential. Regular tune-ups help ensure your heating and cooling systems operate efficiently, reducing the circulation of dust and allergens. When you work with a trusted HVAC provider, their experienced technicians will thoroughly inspect and clean your system. This proactive approach not only extends the lifespan of your equipment but also helps identify potential issues before they lead to costly repairs. Furthermore, a well-maintained system can improve airflow, contributing to overall comfort. Don't wait for problems to arise—schedule your HVAC maintenance today to enjoy cleaner air and a more comfortable home. Remember, your indoor air quality directly impacts your health and well-being, so investing in professional care is always a wise choice.

Book a Service Today