Do It Yourself Furnace Repair: Is It Safe?

Are you a homeowner dealing with furnace problems? Are you searching for ways to repair your heating system without calling an expert? While performing do-it-yourself furnace repairs may seem attractive, weighing the potential risks versus the rewards is essential.

In this blog post, we explore all the factors involved when considering DIY furnace repair and answer some frequently asked questions about safety. Read on to find out more!

Safety First

When repairing your furnace, safety should be the number one priority. You will be dealing with electrical components, gas connections, and other dangerous apparatus that can cause injury or damage to your home. Turn off the power supply to the furnace before getting started. Turn off the gas supply, and check that there is no residual gas in the furnace.

When working on your furnace, it is also essential to make sure that you have proper lighting. A poorly lit area can lead to slip-and-fall accidents, burns, and other injuries. Also, keep flammable materials away from the furnace, especially when melting or soldering.

Proper Ventilation

Proper ventilation is crucial when dealing with any heating or cooling system. You need to maintain a clean and clear pathway for air to flow. Before repairing your furnace, inspect the area and ensure proper ventilation. If you’re working in a basement, ensure that windows and doors are open to allow fresh air in.

Appropriate Safety Gear

When repairing your furnace, make sure to wear appropriate safety gear. Appropriate safety gear includes gloves, goggles, and a mask. Gloves will protect your hands from burns and electrical shocks. Goggles will protect your eyes from debris, dust, or harmful chemicals. A mask will protect your lungs from toxic fumes or dust created during the repair process.

It is also essential to dress appropriately when performing a DIY furnace repair. Avoid loose or baggy clothes, but wear something that allows you to move around comfortably. Dress in layers that are easy to take off, as the temperature in the repair area may fluctuate.

Assess the Problem

Before starting DIY furnace repair, it is essential to assess the problem carefully. Some furnace repair issues are easily fixable, but others require professional assistance.

Identifying the Furnace Problem

The first step in assessing your furnace repair needs is identifying the problem. Some common furnace problems include a lack of heat, strange noises, or poor performance. Each of these problems can stem from various causes, so it is essential to thoroughly inspect your furnace.

Check the thermostat settings to ensure they are correct. If you hear strange noises from the furnace, it could mean that some parts have become loose and require tightening. Also, check that the air filter in the furnace is clean, as a dirty air filter can cause noise and decrease efficiency.

Determining if It Requires Professional Help

After identifying the furnace problem, the next step is determining whether it requires professional help. Furnaces are intricate systems that need a professional’s help fixing problems like gas or electrical issues. If your furnace requires electrical or gas work, call a licensed professional.

If you have tried a few easy fixes and the problem persists, there is likely a more significant problem that requires professional attention. Hiring a professional gives you peace of mind knowing that an expert will repair your furnace safely and accurately.

Easy DIY Fixes to Consider

While some furnace repairs require professional assistance, there are a few easy DIY fixes that you can consider. For example, if the pilot light on your furnace goes out, you can light it yourself by following the instructions on the furnace. Another easy fix is to clean or replace the furnace air filter, which can restore the furnace’s efficiency.

Know Your Limits

When considering DIY furnace repair, it’s crucial to know your limits. Attempting repairs beyond your capabilities can lead to dangerous situations and costly mistakes.

Acknowledging Personal Skill Level

Before starting any DIY furnace repair, it’s essential to acknowledge your skill level. While some furnace repairs are easy and can be done by anyone, others require extensive knowledge and experience. You can evaluate your skill level by taking stock of any HVAC training or apprenticeship programs you may have completed in the past.

If you have no prior experience repairing a furnace, it is essential to consult your user manual or online videos before starting. Attempting repairs without prior knowledge or experience can lead to further damage to your furnace or personal injury.

The Risks of Attempting Repairs Beyond Capabilities

Attempting furnace repairs beyond your capabilities can be hazardous. It can further damage your furnace or cause safety hazards such as burns, electric shocks, or gas leaks. For instance, attempting to repair electrical components in the furnace without proper knowledge can lead to electrocution, fires, or explosion.

Repairing gas piping without the proper tools and training can lead to leaks, which can cause fires, explosions, or carbon monoxide poisoning. If you’re unsure you can handle a repair, calling in a professional is essential.

Benefits of calling in a Professional

While DIY repairs can be tempting, calling a professional can save you time and money and ensure the repair is done safely and accurately. Furnace repair professionals have the expertise, experience, and tools to handle all furnace repair tasks. A professional will also provide a warranty, ensuring the repair is reliable.

Another benefit of hiring a professional is knowing that the repair is safe and there will be no danger to your home or any of its occupants.


DIY furnace repair can be an excellent solution for many homeowners who want to save on repair costs. However, it is essential to remember that safety should always come first. Before attempting furnace repair, evaluate your skill level and decide if the task is safe to complete.

While some furnace repairs are easy and can be done as a DIY project, it’s crucial to know when calling a professional is best. Professional furnace technicians have the training, experience, and equipment to address complex repair tasks.

DIY repairs can be cost-effective if you have some basic knowledge and experience. However, it’s essential to note that even small mistakes can sometimes cost more in the long run. Therefore, evaluating the task and determining the best course of action is always recommended.


Common Furnace Thermostat Problems

Do you ever feel like your thermostat is playing tricks on you? Does it turn the furnace off at strange times or make changes that leaveyou shivering in your living room? You may be dealing with a malfunctioning thermostat. Before panicking and shelling out money for professional repairs, it’s worth looking at what issues could be causing the problem.

In this blog post, we’ll cover some of the most common furnace thermostat problems and provide tips on troubleshooting them. That way, if you don’t need to call an HVAC technician, you can take care of the thermostat issue yourself!

Problem 1: Poor Temperature Regulation

Temperature regulation is how your thermostat maintains your home’s temperature at a set point. It is done via a heating, cooling, or HVAC system that regulates the temperature according to the programmed thermostat setting.

Poor temperature regulation can happen when the furnace or heating system runs more than it should, resulting in energy waste and higher electricity bills. It can also leave you feeling chilly in some rooms and too warm in others. Temperature regulation issues can result from both thermostat-specific and system-wide issues.

Possible causes

  • Thermostat placement: The location of your thermostat can play a significant role in your furnace’s temperature regulation, as it can be adversely affected by heat-generating and heat-dissipating sources like fireplaces, direct sunlight, and air vents. For instance, a thermostat placed too close to a sunny window may detect a higher temperature and shut off the furnace prematurely.
  • Clogged filters: Poor air circulation caused by clogged air filters can cause your furnace to overheat, resulting in poor temperature regulation. It can also make the heat distribution inconsistent.
  • Thermostat malfunction: A malfunctioning thermostat can lead to severe temperature regulation issues. A thermostat that cannot detect the indoor temperature correctly may continually run your furnace to maintain your set temperature.


The solution to poor temperature must start with thoroughly diagnosing the cause. Simply adjusting the thermostat settings won’t fix the problem. Here are some of the solutions:

  • Thermostat placement: You can avoid the interference of external sources by positioning the thermostat away from sources of cool or hot air. For example, a location that has reliable airflow is ideal for the thermostat.
  • Air filter replacement: Dirty air filters can lead to poor air circulation, make your furnace work harder, and cause temperature irregularities. Regular filter replacement is essential.
  • Thermostat repair or replacement: If you’ve tried other solutions and still experience poor temperature regulation, your thermostat may need repairs or replacement. Contact an HVAC technician to have it checked out.

Problem 2: Thermostat Display Issues

A blank thermostat display is a common issue that many homeowners face. It occurs when your thermostat display doesn’t show information like the current temperature or setting. A blank thermostat display can make adjusting the temperature challenging and lead to higher electricity bills. Several factors can cause a blank thermostat display, and fixing the problem requires identifying the underlying cause.

Potential reasons

  • Dead batteries: If your thermostat uses batteries, a dead battery could be responsible for a blank display.
  • Wiring problems: Wiring problems such as loose, disconnected, or damaged wiring can cause a blank thermostat display.
  • Tripped circuit breaker: A tripped circuit breaker can cause a blank thermostat display or shut off your entire HVAC system, rendering it useless.
  • Internal issue: A faulty component or malfunction on the internal circuit board can cause a blank display.


  • Replace batteries: If your thermostat uses batteries, replace them with fresh ones, and check if the display comes back on.
  • Check the wiring: Ensure all the wires are properly connected and free of corrosion, dirt, or other debris. If there’s a fault, reconnect the wires or hire a technician to fix it for you.
  • Check the circuit breaker: If you suspect the circuit breaker, turn it off and then turn it back on to see if the thermostat display comes back on.
  • Hire an HVAC technician: If none of the above solutions works, your thermostat may have an internal issue, such as a faulty component or circuit board. Contact an HVAC technician to diagnose and fix the problem.

Problem 3: Short Cycling

Short cycling is when your furnace turns on and off too often, causing inefficiencies and straining your HVAC system. It can lead to increased energy bills, reduced equipment lifespan, and decreased comfort levels in your home. Short cycling may occur for many reasons, but it should not be ignored, as it can lead to long-term HVAC problems.

Possible reasons

  • Oversized furnace: One of the primary causes of short cycling is a large furnace that heats an area too quickly, causing it to turn on and off frequently.
  • Clogged air filters: Clogged air filters can restrict airflow and cause your furnace to overheat, leading to short cycling.
  • Thermostat location: A thermostat in excessively hot or cold air, like the kitchen or direct sunlight, can cause your furnace to short cycle.
  • Malfunctioning thermostat: A faulty thermostat can detect the wrong temperature setting, resulting in your furnace turning on and off more often than it should.


  • Right furnace size: A furnace that’s too small for your house will struggle to heat it, while one that’s too large may lead to short cycling. Consult an HVAC expert to know the right size for your home.
  • Regular air filter replacement: Clean air filters allow for proper airflow and reduce the risk of short cycling. A regular air filter replacement schedule can help you avoid the problem.
  • Thermostat placement: Avoid placing thermostats in locations affected by cold or hot air drafts, direct sunlight, or a kitchen area to regulate temperatures.
  • Thermostat repair or replacement: If your thermostat is malfunctioning, get it repaired or replaced by an HVAC professional.


Furnace thermostats can have common issues that result in short cycling, blank display, and inconsistent temperatures. Identifying the underlying cause and taking preventive measures is essential to prevent long-term problems and keep your HVAC system functioning correctly. If you’re experiencing any common furnace thermostat problems, contact an HVAC professional for help. They will identify the source of the problem and recommend repair solutions to ensure reliable comfort levels in your home.

How to Install Return Air Duct in Wall?

When most individuals think about HVAC systems, they think about the air conditioner and furnace. While these machines play a vital part in the HVAC system, they do not circulate the conditioned air throughout your home. Instead, that is done by supply registers or return air ducts. That’s why you need to learn how to install return air duct in wall.

Return air ducts are essential in any HVAC system. They allow the conditioned air to return to the furnace or air conditioner so that it can be reheated or cooled and then sent back out into your home.

If you decide to replace or install a return air duct, this article will give you a thorough understanding of what to expect.

Why Install a Return Air Duct?

The main reason you need to install a return air duct in your home is because of the way an HVAC system functions. Conditioned air cannot simply go out into the room and be lost. It has to make its way back to the furnace or air conditioner to be cooled down again before being sent back through the air ducts.

If you do not install a return air duct, the conditioned air will go into another room instead of returning to the furnace or air conditioner. It can cause difficulties with your furnace because it has to work harder to heat the room, which is now colder than before. It will also create discomfort in that room because it has no supply registers bringing new, warm air inside it.

Where Should You Install a Return Air Duct?

The best place to install a return air duct is in the wall. It allows you to connect it to your furnace or air conditioner easily and keeps it out of the way.

If you choose to install the return air duct on the floor, you will have to run a tube or pipe from the duct to the furnace or air conditioner. It cannot be easy and can also take up a lot of space.

If you choose to install the return air duct in the ceiling, you will have to drill a hole in the roof and run a tube or pipe from the duct to the furnace or air conditioner. It can also be complicated and can cause water damage if not done correctly.

How Big Does a Return Air Duct Need to Be?

The size of your return air duct depends on the size of your furnace or air conditioner. A small system may only require a two to three-inch return air duct if you have a small system. Also, a more extensive air conditioner may need up to four or five inches in width for the return air duct.

When choosing the size of your return air duct, measure both vertically and horizontally across the front of your furnace or condenser unit. There are very few exceptions where you will need more than this measurement to find an appropriately sized return air duct.

How to Install The Return Air Duct?


  1. Decide where you want to install the return air duct. If you install it on the wall, you will have to drill a hole in the wall large enough for the duct to fit through.
  2. Cut a hole in the wall that is the same size as the return air duct. The hole should be two to three inches lower than the floor. If you place it on a higher level, you will have to run a tube or pipe from the duct to the furnace or air conditioner.
  3. Run a tube or pipe from the hole in the wall to the furnace or air conditioner. Securely fasten the tube or pipe to the wall and the furnace or air conditioner.
  4. Attach the return air duct to the tube or pipe. The duct should fit snugly onto the tube or pipe. If it does not, you can use metal bands to secure it in place.
  5. Connect the return air duct to the furnace or air conditioner. The duct should be securely attached to the furnace or air conditioner.
  6. Check the return air duct for any leaks or openings that may cause problems. If you notice any, seal them up immediately, so you do not lose conditioned air.
  7. Cover the hole in the wall with drywall and plaster. Make sure you completely seal the hole so no air can escape.
  8. Paint or decorate the wall around the return air duct to match the rest of your home.
  9. Test your return air duct installation by turning on your AC system and noting if it is working appropriately. Check the temperature levels, desired air pressure, and the operation of all filters and moving parts.

Hiring AC Repair Service To Install Air Ducts

There are several benefits of hiring an AC repair service to install air ducts in your home.

  • They will have the experience and knowledge to do the job correctly.
  • They will be able to help you choose the right size and type of return air duct for your home.
  • They will make sure to do the installation correctly and that all air ducts are correctly connected.
  • They will make sure you have no leaks or openings in the return air duct that can cause problems with your AC system.

How to Install Return Air Duct in Wall – Conclusion

Installing a return air duct in the wall can be a difficult task, but it is worth it in the end. Choosing the right size of return air duct is essential, and installing it correctly so you do not lose conditioned air. By following these simple steps, you can have an efficient and functional AC system that will keep your home cool all summer long.

If you are having trouble installing the return air duct on your own, hire AC repair Mississauga service to do it for you. We will be able to do the job quickly and efficiently, and you will have peace of mind knowing that the job was done correctly!