Deep Cleaning A/C Unit

Dirty AC Coils

Deep Cleaning Service With Spring A/C Maintenance

How long has it been since an HVAC professional last serviced your A/C unit?  If your answer is years, you’ve likely got years of dirt caked onto your cooling fins.

Unionville Heating provides an exclusive service for deep-cleansing of your outdoor A/C unit. Cleaning will prolong the life of your air conditioning system. Extend your air conditioner’s efficiency and years of service by having it professionally deep-cleaned.

How And Why To Clean Your Air Conditioning Unit

Failure occurs because the unit is not clean, and you can extend its life by deep-cleaning it. Take it apart and wash it. Do this, and you’ll be cool for a long time.

Service begins by removing the grill and inspecting the wiring control box. Next, eliminate the dust blanket and clean the air conditioning coils. A/C coils extract heat from the house. The problem with a dirty A/C unit is that debris insulates the coils with caked-on layers of dust, preventing efficient cooling. You could save yourself two or three years of system replacement by performing a deep-clean service on your air conditioning unit. Deep-cleaning will extend the life of your unit. As we move towards recessionary times, repairing will be more cost-effective compared to replacement of the A/C.

Schedule Your Appointment

Connect directly with our reservation system, powered by HousecallPro.  

How it works:

When you click the Book Online Now button, your browser will open at our reservation partner’s website.  From there, please choose your service by clicking the + icon.  Then choose your day and time for the appointment.  Your appointment will be added to our work calendar schedule without having to call or email our service department.  You will receive a confirmation of your appointment by email.

Recycling Expired AC Units

We recycle all used HVAC equipment including AC coils which failed due to insufficient cleaning.  The images below demonstrate a dirty AC coil.  The life of the AC unit could have been extended if the coil was deep-cleaned and maintained.  We care!

Make An Appointment to Request A/C Deep-Cleaning

Please complete the form.  We’ll contact you to confirm your appointment day and time.

Service Maintenance and Repair

We at Unionville Heating & Air Conditioning Ltd maintain a standard of excellence and provide our customers with products, best suited to their needs, to improve energy efficiency and help lower the energy bills in their home.

We Service All Brands

Carrier, Goodman, Trane, Rheem, Lennox, York, Ruud, Heil, Contitental, Napoleon, Concord, Ducane, KeepRite, Tempstar, Bryant, Luxaire.

Products by:

Air Conditioning & Heating

Spring Air Conditioning Service

A message from the President of Unionville Heating Ltd. John St Germain

Important Information To Customers

We remind you to obtain a spring air conditioning service.  Perform an AC service now.   It is most important for units that are builder installed and over 3 years old without ever being serviced.  You could be in for a long wait when the first heat wave arrives in Ontario and your unit doesn’t work.

We receive the same phone calls every year for the last 35 years from customers saying “We had our unit installed 3 years ago and now it’s not working. We called the guy but he is not answering his phone or the number is out of service. My AC unit is still under warranty”

You can save money on the original purchase by buying the lower priced model from an entry level contractor. As a result,  homeowners will now need to spend more money to get the system working properly or replace it altogether.

Get cooled off, Not ripped off

This year is very different from years past, due to the outbreak pandemic.

Now more than ever is the time that we need our air conditioning systems working at their peak performance.  Service your AC unit before the upcoming summer months by a reputable company you see in the community.

Our company usually starts our spring air conditioning service in mid-April.

Covid-19 has changed that.

We service our contract customers’ units by cleaning, testing and running efficiently before the heat hits.

Your home is your castle this year in particular.  People are spending less money on travelling.  Isolation orders have changed our lives.

Be proactive now and stay ahead of the curve.  Decide to have your air conditioning serviced for this cooling season if it’s been over three to five years.

As the owner of Unionville Heating, I see the rush hit every year.

People wait for the first heat wave and end up last in line for service from a qualified and respected company. In light of that, some people opt to work with any contractor, one that can be in your home in a few hours. Unfortunately for these customers, they set themselves up for disappointment and waste their money on cut rate pricing and poor workmanship.

Skilled labour is not cheap and cheap labour is not skilled.

Plan ahead, do your research and you’ll find that our company will be here to take the best care of your home and your family because “WE CARE”

A message from the President

John St Germain

Unionville Heating and Air Conditioning Ltd.

Click here to book an appointment for spring AC service

Indoor Air Quality and Safety during COVID-19

Spring Air Conditioning service, air circulation improves Indoor Air Quality

Spending More Time Indoors Due to Self-Isolation

With regard to COVID-19 and the effects on people in our community, President of Unionville Heating John St.Germain says,

“We care about our staff, and we care about our customers. Unionville Heating and Air Conditioning is open for business and here to help. We are spending more time in our homes now, more than any other time over the last ten years.  As a result of spending all this time inside, Indoor Air Quality (IAQ) is an important issue that customers need to know about.  Proper ventilation, filtration and cleaning are necessary to be healthy and safe indoors.”


The Government of Canada provides information about ways improve or maintain good IAQ.

Here are 8 things you can do right away to improve the air quality in your home:

  1. Make sure your furnace is well-maintained to prevent carbon monoxide (CO) accumulation.
  2. Change the furnace/AC filter regularly. It is important to replace or clean filters regularly as per manufacturers’ instructions. Removal rates for filters can change over time. Don’t forget about other portable air filters in the house.
  3. Use the exhaust fan in the bathroom when showering or bathing to reduce humidity and prevent mould growth.
  4. Use your range hood to reduce your exposure to pollutants from your gas stove such as nitrogen dioxide (NO2) and humidity from cooking activities.
  5. Install at least one CSA-approved carbon monoxide (CO) alarm close to bedrooms.
  6. Ventilate your home by making sure there is good air circulation and control the humidity.
  7. Outdoor particulate matter levels may often be higher than indoor levels. Therefore, natural ventilation (from an open window or door) may not always be effective in reducing indoor levels. This is especially the case on poor air quality days, so use an air conditioner when it is smoggy outside, if possible.
  8. Regular house cleaning using a mix of methods can help improve indoor air quality. Keep your rugs and carpets clean.  Clean hardwood and tile floors with a damp mop.


Spring Service

Servicing your air conditioning unit at some point in the near future will likely become necessary.  There is typically a rush when the first hot day arrives.  That’s usually the first nice warm day in the spring where everyone will want to turn on their air conditioning units.  It’s at that point Unionville Heating receive requests for an incredible amount of service calls.

John is hoping that customers will take a proactive approach with regards to keeping safe, and offered this advice to homeowners with AC units,

“If this physical distancing and isolation continues into the late summer as some are predicting, the last thing we want on the first heat wave, is 300 ‘no-cooling’ phone calls. People need to know they can pre-book their AC service on-line and stay ahead of the curve. If we all do our part, we can help to flatten the curve and provide a healthy environment to our customers while in isolation in their homes over the next few months.”


To keep us all safe, Unionville Heating has prepared this information we would like you to know:

  • Our staff is trained and have all the necessary tools to protect themselves, their families and our customers.
  • Important! Safety is our first priority in responding to any service call.


We have developed the following processes to ensure we all stay safe:

All customers calling in for service must follow our safety processes or we will reserve the right to refuse service.


Process at time of booking:

Answering the pre-appointment questions:

  • Has anyone in the home been out of the country in the last 2 weeks?
  • Have they been in the company with anyone who has been out of the country in the last 2 weeks
  • Is anyone in the house sick or coughing?


Process for service call at your home:

  • Everyone maintains a 2 metre distance from our techs while in their homes.
  • The customer must prepare and sanitize all door entries to the furnace and outdoor A/C units.
  • Absolutely no contact by shaking hands or coughing or sneezing within the 2 metre distance.
  • The company will supply any and all protective gear and or disinfectants necessary to do our job safely.
  • When we arrive to your home, we call you from the driveway and ask to allow us entry and to be sure we are aware of our social distancing and safety process.
  • We will send an invoice after the service or you can pay by e-transfer

Maintain Good IAQ in Your Home

As a result of self-isolation, the indoor air quality of our homes has become a more important issue since we are spending more time indoors.  Unionville Heating can provide your spring air conditioning service in a safe way and in a timely way if you schedule your appointment before the rush.

Call our office (905-479-1290) or book online.

Cost to remove an old furnace

recycling old furnace and air conditioning parts

How much does it cost to remove an old furnace?

With Unionville Heating and Air Conditioning there is no additional charge to remove and dispose of your old HVAC parts.  We care about the environment and would not leave you with the burden of having to remove your old furnace.  Old furnace and A/C removal cost is free with Unionville Heating.

Once your new A/C or furnace is installed, we’ll take your old unit away.  You recycle every week at the curb side separating cardboard, cans and glass.  However municipal waste collectors will not pick up your old furnace or air unit.  Just because an item doesn’t belong in your recycling bin doesn’t mean that you can’t get rid of it responsibly.  Unionville Heating and Air Conditioning will do that for you.

We make sure your old furnace or air conditioning unit doesn’t end up in the land fill.  We separate the components and work with a recycling expert to ensure the materials enter the recovery stream according to the type of waste.

Unionville Heating has been recycling furnace and air conditioning units for over 35 years.  We have recovered close to 20 tons of refrigerant since then.

Regular maintenance benefits.

Regular inspection, old furnace repair, or replacement is important. Repairs will give you better furnace service life.  A new furnace will provide safe and cost-effective heating that you may not have realized you were living without.

Have your furnace and air conditioning unit serviced once a year. Find a company you trust and stick with them.  The cheapest guy on the block is probably not going to do the best job, so look for a professional, not just Jimmy down the street who is HVAC certified.  Keep records of HVAC service. One day if you sell the house, documents of well-maintained large components will help with the salability of the home.

Regulations Amending the Energy Efficiency of Gas Furnaces

Regulations Amending the Energy Efficiency Regulations

Heating, Refrigeration and Air Conditioning Institute of Canada (HRAI) has sent a message to manufacturers and installers of gas furnaces in Canada.

What this means to Canadian consumers:

Gas furnaces installed in Canada effective December 12, 2019 must meet the new minimum requirements as described in the Energy Efficiency Act. Consumers need to be aware that less efficient units may be flooding the market in manufacturer’s attempts to liquidate their old stock.

Message from the HRAI: This message is intended to clarify the new requirements for residential gas furnaces contained in Amendment 15 to the federal Energy Efficiency Regulations, which was published in the Canada Gazette II on June 12, 2019. NRCan has advised HRAI that they have been hearing about some confusion in the field about the new requirements.

The federal government has set the new minimum standard for gas furnaces at 95% AFUE. Effective December 12, 2019, any product with a date of manufacture after July 3, 2019, must meet the 95% AFUE level.

As an example, after December 12, 2019, a 90% AFUE furnace that was manufactured on August 2nd cannot be shipped into the country or across provincial borders for the purpose of sale or lease.

For product manufactured in Canada, shipments will be subject to the federal regulation at any provincial border. Where provincial regulations exist for those products, they would apply well.

About the Regulation:

Regulations Amending the Energy Efficiency Regulations

About HRAI:

Heating, Refrigeration and Air Conditioning Institute of Canada (HRAI) is a non-profit national trade association of manufacturers, wholesalers and contractors in the Canadian heating, ventilation, air conditioning and refrigeration (HVACR) industries.

How Your House is Cooled – Science Explained

AlumaFin7 Evaporator Coil - Goodman - sold by Unionville Heating and Air Conditioning

Ever wonder how your home cooling system work in the heat of the summer?  Goodman has made this informative video to explain how it works.

Your AC’s Evaporator Process

The evaporator coil is the component in an air conditioner or heat pump that is responsible for the cooling of a home. The evaporator reduces the temperature but does not actually make anything cold. Cold is really defined as there being no heat. Things are made colder when there is heat being removed. So when cooling your home, your AC is just removing the heat from your home. Technically your evaporator is there to absorb the heat and remove it.

The direction of heat transfer is normally from a warmer substance to a cooler one. Your evaporator needs to be cooler than the air being blown over it so that way it picks up the heat in the air and transfers it through the refrigerant. The constant flow of refrigerant results in constant heat transferring. Dehumidification also occurs because the evaporator operates at a temperature less than the dew point, if the temperature is above the dew point then there will be moisture in the air, and if it’s less than it, then it will condense and there won’t be moisture in the air.

The combined effect of the compressor and metering device of the air conditioner or heat pump allow the refrigerant in the evaporator to stay at a low temperature because they make the pressure of the system really low. The lower the pressure of the coil the lower the temperature and the higher the pressure the higher the temperature. For the evaporator we want low pressure so that its at a low temperature that will absorb heat. The compressor makes the refrigerant denser and the metering device releases pressure. Refrigerant will enter the evaporator coil as an 80% liquid and a 20% vapor from the compressor and metering device.

As the refrigerant flows in the evaporator heat is absorbed by the refrigerant, the liquid refrigerant will boil or evaporate into vapor. Heat that cannot be measured by a thermometer, known as latent heat or hidden heat causes the refrigerant to boil. The temperature of the refrigerant does not increase but its physical state changes instead (changing from a liquid to a vapor). The refrigerant will continue through this process making all of it become vapor and then it goes through super heat.

Super heat means the “vapor refrigerant” is still receiving more heat that is increasing temperature. The heat transfer that causes the super heating is a sensible heat transfer, sensible heat can be measured by a thermometer, and it’s called sensible heat because it can be “sensed”. The refrigerant super heating at 100% vapor will still continue to absorb heat as it enters the compressor. Evaporators on residential homes are dry-type evaporators because they boil off all refrigerant into 100% vapor making the coil “dry”.

Summary Of Your AC’s Evaporator Process

Your evaporator coil will have refrigerant flowing through it from the rest of the air conditioning system. The refrigerant will enter the evaporator as a cold 80% liquid and 20% vapor. The refrigerant picks up heat from the air blowing over the evaporator coil as the refrigerant flows through it. Once the refrigerant picks up enough heat it goes through latent heat transfer, physically changing it completely into a vapor but not increasing temperature, because latent heat cant be measured with a thermometer. Once the refrigerant becomes 100% vapor, it superheats, superheat is just the amount of heat absorbed by the “vapor refrigerant” that increased the temperature. Then the “vapor refrigerant” goes through high pressure in the compressor, condenser, txv and metering device, where it comes back into the evaporator as low pressure cold refrigerant that is 80% liquid and 20% vapor.