Compressor Types: Single, Two-Stage, Variable-Speed

July 17, 2024

Variable-speed compressors are one of the most recent products in residential air conditioning. It’s a huge leap forward for getting the perfect indoor temperature most efficiently. And if you’re wondering “What’s the difference between single-stage, two-stage, and variable-speed compressors,” here’s the simple answer: Variable-speed compressors are the better choice. 


But you weren’t looking for the simple answer, were you? Let’s talk about why it’s the better choice. 


Understanding Traditional Air Conditioning 

Single-stage compressors are the most basic type, offering only one level of operation: high. This means they run at full capacity whenever they are on, cycling on and off throughout the day. 


Single-stage compressors blast your home with cold air and turn themselves off when they reach the temperature setting on your thermostat. For example, if you set the thermostat to 75 degrees, the air conditioner will run anytime indoor temperatures hit 76 degrees. After the AC cools the house back to 75 degrees, it will turn off again. 

 

There’s also a two-stage or dual-stage compressor that provides two distinct levels of operation: high and low. This allows for more efficient and flexible cooling compared to single-stage systems. A two-stage unit runs at full capacity when you need it to and at a lower level when you don’t. Two-stage units don’t run as continuously as a variable-speed AC, but they do cycle on and off less frequently than single-stage systems. 


Basics of Variable-Speed Air Conditioning

Variable-speed compressors work differently. To maintain an indoor temperature that matches the setting on your thermostat, they operate continuously at less than 100% capacity – often as low as 25% or 30% capacity. As a result, they run for much longer cycles than single-stage AC units. In the summertime, they might run for all or most of the day! 


At this point, you’re probably thinking, “It’s hot out there! Why would I want an air conditioner that runs longer and cools my home slower?” 


Well, a variable-speed compressor’s longer run times dehumidify your home more effectively than the short cycles of a single-stage unit. One of the biggest problems with single-stage compressors is that they’re not running continuously. Relative humidity increases whenever the AC isn’t on, making you feel hotter and more uncomfortable. 


Most people deal with this problem by lowering the temperature on their thermostat, which brings us to the other benefit of variable-speed compressors: cost. 


The Cost of Comfort

A single-stage compressor blasts your home with cold air before it turns itself off. Then it turns on again when the indoor temperature increases. Most of your air conditioner’s electricity draw occurs when it turns on, not while it’s running. In the summer, a single-stage compressor turns on and off a lot, known as “short cycling.”  Short cycling can become an issue when it is above 95 degrees outside and you’re gaining heat about as fast as your A/C can remove it. 


Since single-stage compressors have short cycles, they draw a lot more electricity than a variable-speed unit that turns on and stays on (at a low speed) for hours. They also don’t dehumidify indoor air very well, forcing you to lower the temperature setting on your thermostat. As a result, the single-stage AC is much more expensive to operate! 


Two-stage compressors don’t turn on and off nearly as much. They’re more efficient than single-stage units, but not as efficient as variable-speed compressors. Variable-speed air conditioners run continuously, dehumidifying the air inside your home.  As a result, you feel comfortable at higher temperatures and don’t have to set your thermostat so low. And since they don’t turn on as often, variable-speed AC units lower your energy bill. 


 

Are There Other Benefits? 

Believe it or not, more effective cooling and greater efficiency aren’t the only benefits of a variable-speed compressor. 


If you’re concerned about indoor air quality, opting for a two-stage or variable speed unit can help purify the air circulating your home, resulting in healthier conditions for you and your family. Since they dehumidify indoor air more effectively than a single-stage unit, a more efficient system helps you eliminate mold growth in bathrooms and kitchens, prevent dust mites, and create conditions that aren’t suitable for insect intruders. 

And since variable speed units run more frequently, they also filter your indoor air more effectively. More air is cycled through your return ducts – and your air filters – resulting in a lower volume of air contaminants.  According to the American Lung Association, the average American spends 90% of their time inside, and 62% of that time inside their own home.  Having cleaner air inside your home for yourself and your family is essential. 


Nowadays, you can look beyond “keeping cool” and improve many aspects of home comfort, all through your choice of air conditioning equipment. Variable speed technology is a big reason why. 


Looking for guidance on the best air conditioner for your Lincoln area home? Whether single-stage, two-stage, or variable speed, our team can help you choose the right system. Contact Custom Cooling and Heating today to find the right fit for you. 

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How to Choose the Right HVAC Filter for Your Home

February 17, 2026
Your HVAC filter might seem like a small part of your heating and cooling system, but it plays a huge role in your comfort, air quality, and system efficiency. The right filter helps keep dust, allergens, and debris out of your home while protecting your HVAC equipment from unnecessary wear and tear. Choosing the wrong one, however, can restrict airflow, reduce efficiency, and even shorten the life of your system. At Custom Cooling & Heating , we help homeowners make smart choices that improve indoor comfort and protect their investment. With convenient online ordering for HVAC filters and the option to save 10% through auto delivery, maintaining your system has never been easier. Here’s how to choose the right HVAC filter for your home. 1. Understand Your Filter Size Before anything else, you need the correct size. HVAC filters come in many dimensions, and using the wrong size can allow unfiltered air to bypass the system. Your filter size is typically printed on the side of your current filter. It will look something like: 16 x 25 x 1 or 20 x 20 x 4 This represents length, width, and thickness in inches. If you’re unsure, Custom Cooling & Heating can help you identify the correct size, so you can order with confidence. 2. Learn About MERV Ratings MERV stands for Minimum Efficiency Reporting Value . This rating tells you how well a filter captures particles. The higher the MERV rating, the more particles it traps. Here’s a simple breakdown: MERV 1–4: Basic protection, captures large dust particles. MERV 5–8: Good for most homes, captures pollen, mold spores, and dust mites. MERV 9–12: Ideal for allergy sufferers, pets, and improved air quality. MERV 13+: Hospital-grade filtration, may restrict airflow if your system isn’t designed for it. For most residential systems, a MERV 8–11 filter is the sweet spot. It provides excellent air filtration without putting extra strain on your HVAC system. 3. Consider Your Home’s Needs Your household environment should guide your filter choice: Pets in the home: Choose a higher MERV rating to trap pet dander and hair. Allergies or asthma: Look for filters designed to capture allergens like pollen, mold, and dust mites. New construction or remodeling: Higher filtration helps capture fine dust particles. Smokers in the home: A stronger filter can help remove smoke particles and odors. The right filter doesn’t just protect your system, but it improves the air you breathe every day. 4. Balance Filtration and Airflow It’s tempting to go with the highest MERV rating available, but more isn’t always better. Filters that are too dense can restrict airflow, making your HVAC system work harder. This can lead to: Reduced efficiency Higher energy bills Increased wear on your equipment Potential system damage Custom Cooling & Heating recommends selecting a filter that matches your system’s capabilities while still meeting your air quality goals. 5. Choose the Right Filter Type There are several common types of HVAC filters: Fiberglass Filters: Inexpensive, basic protection, lower efficiency. Pleated Filters: Most popular option, better filtration, longer lifespan. Electrostatic Filters: Use static electricity to trap particles, washable or disposable. High-Efficiency Filters: Ideal for allergy control and improved air quality. Pleated filters are usually the best choice for most homes because they balance performance, cost, and airflow. 6. Replace Your Filter Regularly No matter how good your filter is, it won’t work if it’s clogged. A dirty filter reduces airflow, increases energy usage, and allows dust to build up in your system. General replacement guidelines: Every 1–2 months: Homes with pets or allergies Every 2–3 months: Standard households Every 3–6 months: Thicker, high-capacity filters Keeping up with filter changes is one of the easiest ways to extend the life of your HVAC system and maintain indoor comfort. 7. Take Advantage of Online Filter Ordering Custom Cooling & Heating makes it simple to get the right filters delivered right to your door. Instead of remembering to buy replacements, you can order your HVAC filters online and know you’re getting the correct size and quality for your system. Even better, when you sign up for auto delivery, you’ll save 10% on your filters while ensuring you never forget to replace them. It’s a smart, stress-free way to keep your system running efficiently all year long. Benefits of auto delivery include: Automatic shipments based on your replacement schedule No last-minute trips to the store Consistent indoor air quality 10% savings on every order 8. Protect Your Investment Your HVAC system is one of the biggest investments in your home. The right filter protects critical components from dust and debris, reduces breakdowns, and keeps energy costs lower. A small decision today can prevent costly repairs down the road. Custom Cooling & Heating is committed to helping homeowners maintain comfort, efficiency, and peace of mind. With expert support , quality filters, and convenient online ordering, choosing the right HVAC filter has never been easier. Need more than just filters? We’ve got you covered. Whether you need HVAC maintenance , repairs , or a full system replacement , Custom Cooling & Heating is here to help keep your home comfortable year-round. Order your HVAC filters online today and set up auto delivery to save 10% while staying on top of routine maintenance. And if you ever need additional services, our expert team is just a call or click away. Start your order now and let us handle all your heating and cooling needs with ease.

Why Your Furnace Runs Constantly (And What That Means for Your Home)

January 5, 2026
If it feels like your furnace never shuts off, you’re not imagining things and you’re not alone. One of the most common concerns we hear from homeowners is why their furnace runs constantly, especially during colder months in Nebraska. While some run time is normal in winter, a furnace that seems to run nonstop can be a sign of underlying issues that affect comfort, efficiency, and energy costs. At Custom Cooling & Heating , we help homeowners understand what their heating system is telling them and when it’s time to take action. Here’s what it means if your furnace is running constantly and what you should do about it. Is It Normal for a Furnace to Run All the Time? During periods of extreme cold, your furnace may run longer cycles to keep your home at the set temperature. This can be completely normal, especially if outdoor temperatures are well below freezing. However, if your furnace rarely shuts off or struggles to reach the desired temperature, there may be an issue affecting performance or efficiency. Understanding why your furnace runs constantly starts with identifying the most common causes. Common Reasons Your Furnace Runs Constantly 1. Dirty or Clogged Air Filter A dirty air filter is one of the most common and easily fixable reasons a furnace runs nonstop. When the filter is clogged, airflow is restricted, forcing the furnace to work harder and longer to circulate warm air throughout your home. What this means for your home: Reduced airflow can lead to uneven heating, higher energy bills, and unnecessary wear on your furnace. Regularly changing your air filter helps your system run more efficiently and maintain proper airflow. You can buy your air filters online and save 10% on auto ship. 2. Thermostat Issues or Incorrect Settings Sometimes the problem isn’t the furnace itself, it’s the thermostat. Incorrect settings, calibration issues, or an aging thermostat can cause your system to run continuously. What this means for your home: If your thermostat isn’t accurately reading the indoor temperature, your furnace may think it needs to keep running even when your home is already warm. A properly functioning thermostat helps regulate heating cycles and prevents unnecessary run time. 3. Poor Insulation or Air Leaks If warm air is escaping your home through poor insulation or drafts, your furnace will continue running in an attempt to maintain the desired temperature. What this means for your home: Heat loss forces your system to work harder, increasing energy usage, and reducing comfort. Sealing air leaks and improving insulation can significantly reduce furnace run time and improve efficiency. 4. Mechanical or Maintenance Issues Worn components, improper airflow, or lack of regular maintenance can also cause excessive run time. Small issues can add up, reducing efficiency and shortening the lifespan of your furnace. What this means for your home: Ignoring these issues can lead to more serious repairs down the road. Routine maintenance helps identify and correct problems before they impact system performance. What Constant Furnace Run Time Means for Energy Costs When homeowners ask why their furnace runs constantly, energy efficiency is often the biggest concern. A furnace that runs longer than necessary uses more energy, which can lead to noticeably higher heating bills. Addressing airflow issues, maintenance needs, and insulation concerns can help your system operate more efficiently, saving money while improving comfort. When Should You Call a Professional? If your furnace is running constantly and you’ve already checked the air filter and thermostat settings, it’s a good idea to have a professional take a closer look. Ongoing run time can signal issues that aren’t visible to the average homeowner. A professional inspection can help determine whether your furnace needs adjustment, repair , or routine maintenance to restore proper operation. How Custom Cooling & Heating Can Help At Custom Cooling & Heating, we help homeowners diagnose heating issues, improve efficiency, and stay comfortable throughout the winter. Whether it’s routine maintenance, system repairs, or evaluating overall performance, our goal is to help your furnace work the way it should efficiently and reliably. We focus on practical solutions that extend the life of your system and help prevent costly breakdowns during the coldest months of the year. Take Control of Your Home’s Comfort If you’re wondering why your furnace runs constantly, don’t ignore the signs. Addressing the issue early can improve comfort, lower energy costs, and protect your heating system. Contact Custom Cooling & Heating today to schedule an inspection or maintenance service and ensure your furnace is running efficiently all winter long.