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Gas Furnace Repair & Replacement in Northern VA


F.H. Furr standing next to a Lennox furnace with one hand on the unit while smiling.

As a homeowner, you should have peace of mind knowing your furnace is running as smoothly and efficiently as possible. Having a well-maintained system also prevents costly furnace repairs.

With a cost-effective and dependable gas furnace, you can rest assured that your energy bills will be much lower, and your heating system will require much less maintenance or repair. Your system will keep your home at the most comfortable climate for you and your family, so set your thermostat and enjoy.

How Does a Gas Furnace Work?

A gas furnace uses combustion gases such as propane or natural gas. These gases are ignited by the burners and passed through the heat exchanger. The furnace fan blows the air from your home across the heat exchanger to be warmed. Then, the warm air is blown into your duct system to be distributed throughout your home.

Gas Furnace Heating System Terms

  • Understanding 80% & 90%–95% efficiency units: In an 80%-efficient system, gasses are hot enough that they need to vent conventionally into the chimney stack. In a 90%–95% efficient system, the gasses are much cooler and vent to the outside via an exhaust vent, much like a clothes dryer.
  • AFUE (Annual Fuel Utilization Efficiency): Indicated as a percentage, your furnace’s AFUE tells you how much energy is being converted to heat. For example, an AFUE of 90 means that 90% of the fuel is being used to warm your home, while the other 10% escapes as exhaust with the combustion gasses.
  • Combustion air: Combustion air is the air required to properly burn the gas for your heating system to get maximum capacity.
  • Heat exchanger: This is the part of a furnace that transfers heat to nearby air, the chamber where fossil fuel is burned. An improperly sized heater will cause expansion and contraction of the heat exchanger, which leads to premature aging and cracks.
  • Venting types: Your new gas heater will vent the combustible gasses in one of two ways: via a direct vent system or into an existing chimney. In most cases, the chimney will need to be relined to generate the correct draft.
  • Single-stage gas valve: Single-stage gas valves operate on a basic on/off principle. Each time your thermostat calls for heat, your heating system comes on at 100% capacity.
  • Two-stage gas valves: Two-stage gas valves are capable of two levels of operation: a low stage and a high stage. Properly sized equipment will operate 60%–70% of the time in low stage, enhancing energy efficiency and comfort with perfect humidity levels and quieter operation. It’s like getting two heaters in one.
  • Standard blower: A standard blower delivers a specified amount of airflow based on a tap setting.
  • Variable-speed blower: This high-efficiency blower is designed to deliver a varying amount of airflow based on the desired outcome. These blowers increase the effectiveness of humidification, dehumidification, air filtration, and balance of airflow.

Ready To Install, Replace, or Repair Your Home Comfort System?

Let our friendly and experienced team of Comfort Consultants give you a free Home Comfort System Analysis, which can include furnace diagnostics and repair assessment. They’ll study and discuss any concerns or problems you have with your current system.

They’ll also review all system recommendations and help you find the best home comfort system for your family’s needs and budget. They will even assess and recommend any furnace repair that might be required.

Contact Us for a Replacement!

Want the Benefits of a New Heating & Cooling System for a Low Monthly Cost? Try the Peace Of Mind Comfort Program! 


Our Peace Of Mind Comfort Program is the only one of its kind. It provides you with worry-free comfort and partners you with our professional team of HVAC and indoor air quality technicians to handle your equipment upkeep.

For a low monthly cost, you get a new, high-efficiency system, annual maintenance, air filters, covered repairs, upgrade options, no dispatch or diagnostic fees, no overtime charges, and more.

Learn More Here


Frequently Asked Questions About Gas Furnaces

Annually. The Environmental Protection Agency (EPA) states that it’s very important to “have a trained professional inspect, clean and tune-up central heating systems annually, and repair any leaks promptly.”

The U.S. Consumer Product Safety Commission (CPSC) also “urges consumers to have a professional inspection of all fuel-burning appliances to include furnaces and water heaters.”

A clean filter allows good airflow, which is critical to the efficient operation of any HVAC system. A clean, highly efficient air filter will also protect the system from the harmful effects of dirt buildup on the vital components of the air handler or furnace.

A high-quality air filtration system also provides cleaner air in your home and ensures a higher level of comfort for you and your family.

Immediately evacuate yourself and any other persons/pets from the home and call your local gas utility and/or fire department alerting them of the situation.

There are three factors to consider when making this decision:

  • The life expectancy of the current system: The first thing to account for is the age of your equipment. When your system breaks down, you may be tempted to choose the immediate, least-expensive route of repairing. However, if your system is getting old, repairs will likely be frequent and it may be more cost-efficient to replace it instead of paying for repairs…and then paying for the replacement.
  • Operating cost: As equipment ages, it becomes less and less efficient. Even six-year-old heat pumps and ACs are considered grossly inefficient by today’s energy standards. Repairing your equipment may fix the immediate problem, but it doesn’t address energy efficiency, so that needs to be factored into overall costs. Installing a new heating and cooling system can pay for itself in energy savings within a relatively short time.
  • Looking at the big picture: Although you may be tempted to only address the broken component, be sure to monitor all components of your system, as they all work together to boost efficiency and reliability. For example, if you replace your furnace with a new model but leave the old thermostat, you’re missing out on the efficiencies of the newer furnace. You can also save on installation costs if you upgrade several components at the same time. 

Buying the wrong-size equipment: The Department of Energy states that a large percentage of people who replace their HVAC systems end up installing the wrong-size equipment. The results include high utility bills, buildup of unhealthy mold in the ductwork, damaged equipment, and uncomfortable living conditions.

This can easily be avoided by getting an accurate load calculation from your contractor. The load calculation is determined by your home’s physical characteristics and accounts for your family’s needs. This, along with a detailed system analysis, will correctly verify the proper size of equipment needed for your home.

Choosing the lowest price: If you get a bid that’s significantly lower than the others, it’s probably too good to be true. More often than not, you get what you pay for. Essentially every contractor is installing the same heating and AC equipment and, in many cases, the only difference is the name on the equipment…not the price of it.

There are also laws that regulate how systems are installed, so when bids are lower, you’re saving on installation costs vs. equipment costs. That begs the questions: Are the technicians qualified? Are they taking shortcuts? Are they leaving anything out?

Installation delays: You shouldn’t have to wait days for a heating and AC estimate or even longer to have your system installed. Many companies hire helpers or high school co-op students to work with mechanics. Because mechanics don’t specialize in installing any particular type of system and they lack support, installations can be delayed.

Using untrustworthy & unqualified contractors: Choosing the right contractor can mean the difference between having a horribly expensive experience and an experience you can’t wait to share with friends and family. Here are some steps to make sure you choose the right contractor for you:

  • Research. Doing a little homework on the work to be performed will set you up for success in choosing the right contractor for your job. You don’t need to become a technical expert, but a little research will help you ask the right questions and be able to assess the contractor’s answers and experience.
  • Get three or four contractor referrals from people you know and trust. Referrals from the people you know and who have had hands-on experience with the contractor go a lot further than references from people you don’t know. You’re more likely to get honest feedback from people you know.
  • After identifying a few prospects, make sure each prospect is local and has a physical address. Then, call the Better Business Bureau to verify the company information.
  • Interview contractors. Take time to meet with each contractor and go through your list of questions.

Not getting a written guarantee: Make sure the contractor you choose stands behind the products and services they offer. If they don’t provide a written no-hassle, no-questions-asked warranty, you may not want to use them.

You need to make sure you and your family are protected from any unforeseen breakdowns. Also make sure the guarantee includes a performance guarantee, an investment guarantee, and a 100% satisfaction guarantee. 

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Why Choose F.H. Furr To Be Your Home Comfort Provider?
We Hire “Absolutely the Best” People
We Hire “Absolutely the Best” People

Industry certifications, drug testing, background checks, and commitment to ongoing training set our technicians apart from the rest.

We Protect Your Home As If It Were Our Own
We Protect Your Home As If It Were Our Own

Our strict protocols on precision and cleanliness ensure your home is always left better than we found it and that your property and belongings are protected.

Industry Exclusive Guarantees
Industry Exclusive Guarantees

At F.H. Furr, you benefit from guarantees you won’t find anywhere else, ensuring you get the best treatment the industry has to offer.

Flat-Rate Pricing – Know Upfront What You’re Paying
Flat-Rate Pricing –
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We know how tough it is to budget for home services, so we take away the guesswork by guaranteeing a flat-rate price you can count on.

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Community Involvement & Charities

Our 30+ years of service are only possible because of our community, and we are proud to stay connected through consistent community involvement and charitable donations to local causes.

100% Customer Satisfaction: Past, Present & Future
100% Customer Satisfaction: Past, Present & Future

We aren’t satisfied until our customers are, and our commitment to your satisfaction doesn’t end after just one job. Our 100% guarantee stands for the life of our relationship with all our clients.

See Why Our Customers say we are Absolutely The Best
See Why Our Customers say we are Absolutely
The Best

Excellence, efficiency, and an enduring spirit of service are three of the core values that keep our customers coming back. Our customers’ reviews explain the F.H. Furr difference better than we ever could.

At F.H. Furr, we take pride in hiring “Absolutely The Best” technicians. But don’t just take our word for it — read the rave reviews from our satisfied customers and find out why Baltimore trusts our team with all their HVAC, plumbing, and electrical needs.

The company installed a heating and cooling system. The workers were prompt and explained the process in detail. They cleaned up after the work was completed and fully explained how…
Deborah M.
We had a burst pipe in our basement that caused a power loss. F.H. Furr was able to get someone out to fix the pipe, and Casey came out to…
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