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What is the Difference Between Single-Stage, Two-Stage, and Modulating Furnaces?
Posted On: January 8, 2020
When you are looking around for a new furnace, you will come across three different types: single-stage, two-stage and modulating. You may probably ask, what are the differences between them, and which one is right for your home?
In this article, we will explain the differences between them and help you decide which furnace works best for you and your family.
Single-Stage Furnaces
Single-stage furnaces only have one setting, which is high heat. On a call for heat, they immediately start running at full capacity, no matter what the temperature is outside until the signal coming from the thermostat is turned off. These types of furnaces are best suited for budget-conscious consumers, so in the long run, the upfront cost savings are not realized.
Two-Stage Furnaces
A two-stage gas furnace has two settings, high fire and low fire, and here is how it works. Most of the time, on a typical heating cycle the furnace will start out running on low fire, consuming less gas and electricity, while at the same time providing heat and gaining inefficiency. After approximately 7- 10 minutes of operation, the furnace begins to operate very efficiently because it is fully warmed up. Then, it will jump up into high fire and finish out the heating cycle at full capacity. Control of the high and low burner timing are made by the installers, as part of a new furnace installation.
You could also control the 2 stage burner by using a 2 stage thermostat, the effect of either is similar. Two-stage furnaces are considered more energy-efficient than single-stage because they are not always running at a full heating capacity of the appliance and are often equipped with an ECM blower motor which will also save on your electricity costs.
Modulating Furnaces
Modulating gas furnaces are at the top end of the gas furnace spectrum and are considered to be the most energy-efficient of the three. But, at an added price over two-stage or single-stage furnaces. Heating from a modulating furnace ramps up in increments to maintain a consistent temperature and the ductwork is always warmed up so there is a little efficiency lost during the warming up process.
When buying a modulating furnace you will almost always need to invest in a new thermostat controller specifically designed for this type of furnace in order to get the most out of it. Always ask your salesman about this option, as it is often not mentioned (due to the added cost of the new thermostat). If you are planning to stay in your home for the long-term, a modulating gas furnace may be the right fit for you.
When you want to buy a new furnace, you should always consult your local HVAC experts before making a decision. A trained HVAC technician can come to your home, go over your situation with you and help you decide which furnace best suits your home.
When you are ready for a new furnace, contact the Twintech experts! Our technicians are experienced and knowledgeable in all types of furnaces and HVAC systems.
For more information about our services, visit our website or give us a call at 1-844-894-6832. Contact Twintech today!
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See What Our Customers Are Saying:
Jan 1, 2015
Really nice honest guys. It was a pleasure to do business with a company that does exactly what they say theyre going to do! My basement was cleaner after they installed my new furnace and AC. Thanks again Greg and Grant and for doing such a great job.
Jan 1, 2015
5 star service!! I had twin tech install a high efficiency furnace and hot water tank at my home. I am taking time to write this review as a thanks for what I viewed as next level service that went above and beyond. Prior to installation they explained my specific options without pushy sales tactics and up front costs. Greg and Grant replaced a large portion of the duct work (built in their own shop) that had rusted over the years which resulted in a great looking job. It was a pleasure to work with people are passionate and take pride in their work. Following the installation they explained all aspects and maintenance of the new equipment. Products have worked flawlessly. Thanks again Greg and Grant! Highly recommend!!
Jan 1, 2015
Twin Tech was great; they were honest, reliable and very thorough. I would recommend their services and will definitely be using them in the future.
Jan 1, 2015
Hi Dave, Thank You Dave for coming to my aid this past summer when my AC quit. Your men did a great job installing and cleaning the area. The unit is working very well and i would highly recommend your company TwinTech. Dave you delivered what you sold and i truly appreciate it.
Jan 1, 2015
My experience with TWINTECH has been excellent, start to finish. While doing market research I made a list of several local companies and called them for some high-level information. Dave was the first to call me back, and the only one to book a meeting to see my place in order to give an informed, accurate estimate. He reviewed the different AC makes and models with me, explained the technology, and made a recommendation appropriate to my home. The installation went smoothly. I had one post-installation issue there was moderate noise/vibrations coming from the duct system. I called about this, booked an appointment, and the technician resolved the issue during the service call. I feel assured having a 10-year warranty on parts & labour. I would recommend TWINTECH to anyone considering an AC or furnace for their home. Regards,
Jan 1, 2015
Thank you for your attention to detail regarding my purchase of a new air conditioner. Twintech arrived at the appointed time and were totally professional on the installation process completing the job quickly. PS thanks for the assistance applying for the government rebate
Jan 1, 2015
Dave and the guys from Twintech did a great job of installing my AC. They came on time did a nice neat job and cleaned up after themselves! Do not waste your time call Twintech first.
Jan 1, 2015
My AC unit was not working at all and our furnace that was still working but not giving us any trouble was over 15 years old. So I had 3 heating companies come out to give us a quote on replacing both the AC and the furnace at the same time. Two companies right away recommended that I replace both units simply because they were old. Dave from twintech however suggested that we save some money and replace the AC only because it seemed to him that the furnace was still in great shape and was running fine. He told us that he would have his technicians inspect the furnace thoroughly when they had it apart to install the AC. My husband was at home when the furnace was apart and was very impressed when the tech took him downstairs to personally show him that the furnace was in excellent working condition. He also cleaned the furnace at no extra charge. So now I have an honest heating and AC company that I can highly recommend to other home owners. Great job Thank You!
Jan 1, 2015
I had made the decision to replace my furnace and AC earlier this year. After meeting with several HVAC contractors I decided to go with Dave and his company. Dave was on time, polite, friendly and very professional. He took the time to answer all my questions and to explain the scope of work that would be required to do the job. The technicians arrived on time did a professional installation and completed the job on schedule. They respected my home by putting down vinyl runners to protect my floors and did a very thorough clean up. Im very pleased with my decision to go with Dave and his team. I would highly recommend them to anyone who is considering upgrading their furnace and air conditioner.
Jan 1, 2015
I have no problem in recommending Dave and the TWINTECH team to any home owner who is looking for quality heating and AC products and expert service.
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