What Size HVAC System Do I Need? A Guide for Homeowners in Austell, GA and Surrounding Areas
Choosing the right size HVAC system is one of the most important decisions homeowners can make when it comes to comfort and energy efficiency. Whether you're replacing an old unit or installing a new system in your home, size matters—and bigger isn’t always better. If you live in Austell, Douglasville, Powder Springs, or the surrounding area, the expert team at Hammond Services is here to help you make the right choice.
Why HVAC Size Matters
An HVAC system that's too small will struggle to keep your home comfortable during extreme temperatures, running constantly and wearing itself out early. On the other hand, a system that’s too large may cool or heat your home too quickly, causing frequent on/off cycling that leads to poor humidity control and higher energy bills. Proper sizing is critical for:
- Energy Efficiency – Right-sized systems use less power
- Comfort – Consistent temperatures and better humidity control
- System Longevity – Avoiding unnecessary wear and tear
- Cost Savings – Reduced utility bills and fewer repairs
Factors That Affect HVAC Sizing
There’s no one-size-fits-all answer when it comes to HVAC systems. Professionals use a process called a Manual J Load Calculation to determine the ideal capacity for your home. This calculation takes into account:
- Square footage of your home
- Ceiling height
- Number and placement of windows
- Insulation levels
- Local climate (like our hot, humid summers in Georgia)
- Number of people living in the home
- Heat-generating appliances and lighting
Simply relying on square footage alone can lead to oversizing or undersizing, which is why it’s so important to have an expert evaluate your specific needs.
Common HVAC Sizes and What They Mean
HVAC capacity is typically measured in tons, with one ton equal to the ability to cool 12,000 BTUs (British Thermal Units) per hour. Most residential homes use systems ranging from 1.5 to 5 tons. But again, the correct size for your home depends on the variables listed above.
Don’t Guess—Get Expert Help from Hammond Services
Determining the right HVAC system size is too important to leave to chance. The licensed professionals at Hammond Services specialize in HVAC installations across Austell, Douglasville, Mableton, and surrounding communities. Our team
uses advanced diagnostics and proven calculations to ensure your new system is perfectly matched to your home’s unique requirements.
We also offer a full range of plumbing
and electrical services, so we’re your one-stop shop for complete home comfort.
Ready for a More Comfortable, Efficient Home?
If you're considering a new HVAC system
or want to make sure your current one is the right fit, contact Hammond Services
today. Our experienced technicians will provide a customized assessment and recommend the ideal solution for your home.
Call now and schedule your consultation in Austell, GA or surrounding areas.

Hammond Services Now Serving Metro Atlanta Homeowners With Expert HVAC, Plumbing, and Electrical Solutions For over four decades, Hammond Services has built a reputation as one of Georgia’s most trusted home service providers. Known for dependable heating and air conditioning, expert plumbing work, and safe, code-compliant electrical solutions, the team at Hammond Services is proud to announce their expansion into Metro Atlanta. Homeowners in the greater Atlanta area now have access to the same high-quality service that customers in south metro Georgia have relied on since 1979. Why Metro Atlanta Homeowners Can Count on Hammond Services With so many HVAC, plumbing, and electrical companies to choose from, it’s important to know who you can trust. We know how it feels when something goes wrong in your home. You’re stressed and want it fixed fast, but you also want it done right the very first time. That is what drove us to open our doors over 40 years ago. The Hammond family started this business back in 1979 and they are still living in the neighborhood today. Our reputation is built on honest work, reliable customer service, and a commitment to solving problems the right way, not just the fast way. Metro Atlanta homeowners can now benefit from: Licensed, insured technicians and plumbers Prompt, on-time service Upfront pricing with no surprises Emergency availability A full guarantee on all work From simple repairs to full installations, Hammond Services does it all—and now they’re doing it across the Atlanta metro area. Full-Service HVAC for Metro Atlanta Homes Whether you’re battling Georgia’s summer heat or keeping warm during an unexpected cold snap, your home’s HVAC system matters. Hammond Services offers: Air conditioning repair , maintenance , and installation Heating system repair and replacement Indoor air quality improvements HVAC tune-ups and inspections Energy-efficient system upgrades As the seasons shift, having a dependable HVAC partner makes a difference. With Hammond Services, Atlanta homeowners get quick response times and trusted expertise to keep their homes comfortable all year. Expert Plumbing Services From a Name You Know From water heater installations to stubborn clogs, plumbing problems can disrupt your day fast. Hammond Services provides: Drain cleaning and clog removal Water heater repair and replacement (tank and tankless) Pipe leak detection and repair Toilet, faucet, and sink repair or installation Sump pump and sewer line services Whether it’s routine maintenance or a plumbing emergency, Metro Atlanta residents now have a reliable team on call. Safe, Dependable Electrical Services Electrical problems can be both inconvenient and dangerous. Hammond Services brings licensed expertise to every project, including: Electrical panel upgrades Lighting and ceiling fan installations Outlet and switch repairs Whole-home surge protection Backup generator installation Whether you’re renovating, upgrading your system, or simply need a safe fix, Hammond’s certified electricians are ready to help. Serving Griffin, Newnan, Austell, and Now the Greater Atlanta Area With deep roots in south metro Georgia, Hammond Services is proud to now serve a wider area. The expansion into Metro Atlanta means faster response times and more accessible home service solutions for homeowners across: Griffin Newnan Austell Douglasville Fayetteville Peachtree City McDonough Stockbridge And more nearby communities If you’re in the Metro Atlanta area and need trusted help for your home’s HVAC, plumbing, or electrical systems, Hammond Services is just a call or click away. Ready to Schedule Service? Experience the professionalism and reliability that has made Hammond Services a household name since 1979. With decades of experience, licensed technicians, and an unwavering focus on customer satisfaction, they’re ready to bring comfort, safety, and efficiency to more Georgia homes than ever before. Call or book online today to schedule your service with Hammond Services—now proudly serving Metro Atlanta.

Summers in Georgia can be intense. Brutal heat and high humidity often make your home feel like a sauna. With air conditioning demands soaring, this can overload the power grid, leading to brownouts, partial power reductions that dim your lights and shut down non-essential appliances. While brownouts aren't as severe as blackouts, they can still cause disruptions, especially during Georgia’s hottest months. For tips on how to prepare for power outages, including stockpiling essential items, check out the Power Outage Preparedness Tips from Georgia Electric Membership Corporation . The Challenge of Summer Brownouts in Georgia Brownouts occur when the electrical grid becomes overloaded, and utility providers reduce the voltage temporarily to avoid a complete power failure. This is especially common during Georgia’s brutal heatwaves and thunderstorms, two weather events we see all too often in the summer. With the extreme heat, high humidity, and unpredictable storms, having reliable power becomes crucial for Georgia homeowners. Although a short power dip might seem minor, brownouts that last for hours can have serious consequences. Here’s why: 1. Health Risks for Pets and Babies The heat can be dangerous, particularly for pets and young children. Without air conditioning or fans, temperatures inside your home can rise quickly. Pets, especially those with thick fur, are at risk of heatstroke and dehydration. Babies, who have a harder time regulating their body temperature, are also vulnerable to overheating, which can lead to serious health issues. 2. Impact on Medical Devices For people who rely on powered medical devices like oxygen concentrators, CPAP machines, or refrigerated medications, brownouts can be life-threatening. The high humidity in Georgia can make respiratory conditions worse, making it even more critical to maintain a steady power supply for medical needs. 3. Food Spoilage & Home Disruptions During a brownout, refrigerators and freezers may not run at full power, which can cause food to spoil more quickly. Perishable items like dairy, meat, and seafood can become unsafe to eat in just a few hours without consistent cooling. This can lead to wasted groceries and potential health risks if spoiled food is consumed. Investing in a backup generator can help keep your refrigerator running and prevent costly food loss during extended power disruptions. Preparing for Power Disruptions Year-Round Although summer brownouts are a common issue, power disruptions can also occur during other seasons. For example, winter blackouts in Georgia can bring dangerous cold temperatures and heating system problems. For more insights on preparing for power outages throughout the year, check out our blog on Generac Generator Maintenance: Keeping the Power On When It Matters Most to ensure you're ready for any unexpected disruptions. How to Prepare for Brownouts in Georgia The best way to protect your home from the effects of summer brownouts is to prepare in advance. One of the most effective solutions is investing in a generato r. Whether you choose a whole-home standby generator that automatically kicks in when power drops, or a portable generator to keep essential appliances running, having a backup power source can keep you out of the dark when the grid goes down. Here’s how you can be ready: Backup Generators: A whole-home generator is a reliable way to keep essential systems like air conditioning, refrigeration, and medical devices powered during brownouts. These generators automatically turn on when the power goes out, ensuring your home stays functional. Portable Generators: If a whole-home generator isn’t in your budget, a portable generator can still power critical appliances, like your fridge and AC, during a brownout. Energy Conservation: Being mindful of energy usage, like running appliances during off-peak hours or keeping blinds closed to block out heat, can help reduce stress on the power grid. Electrical Inspections & Repairs: It’s also a good idea to have an electrical inspection done to make sure your home’s wiring can handle the additional load. If there are any issues, electrical repairs can ensure your system is ready for whatever the summer brings. Stay Ahead of Summer Outages in Georgia Summer brownouts are a reality here in Georgia, but with the right preparation, you can minimize the impact on your home and family. Investing in a generator, practicing energy-saving habits, and scheduling an electrical inspection will help you stay cool, keep your loved ones safe, and avoid the frustration of power interruptions. Don’t wait until the next heatwave. Take action now to stay powered all summer long. Ready to Stay Powered All Summer? Don’t let summer brownouts disrupt your comfort or safety. For expert advice on generators, electrical inspections, and electrical repairs in Griffin, Newnan, Stockbridge, or nearby areas, Hammond Services here to help! We’ll ensure your home stays cool, secure, and fully operational, no matter what the weather brings. Contact us today to schedule your services and enjoy a worry-free, comfortable home this season!