Replacing Your Central Air-Conditioner

What you need to know about replacing an old, broken air-conditioner.

Whether or not to repair or replace an older, failing AC unit is a timeless question. When your old air conditioner fails, the first necessary step to undertake is to figure our whether it can be fixed, or whether or not the entire system will need replacing. We’re experts at assessing and fixing failing AC systems, and can help you determine what needs to be done to get your AC up and running for the winter.

Air-conditioner repairs Toronto? Cozy World Inc. can help.

Some background information on air conditioners might be helpful in understanding our process.  An air conditioner has two main parts: an evaporator and a condenser, of which only the condenser is visible. The condenser is visible in all AC units, and sits outside the house squeezing heat out into the outside air. The evaporator on the other hand, sits inside your ductwork and absorbs heat from the inside into the refrigerant. Usually when your AC breaks or fails, it’s the condenser that is the culprit since there are so many things that can happen to that external portion.

If you’re going to replace one of these parts, it’s best to replace the other as well. Condensers and evaporators are notoriously bad at adjusting to each other if not properly matched, meaning that one has the potential to mess up the other’s functioning if they are not selected carefully. Thankfully, it’s not too difficult to match these two components, as when you install a new air conditioners, you can see the ARI Reference Number page and match the SEER ratings of both parts to each other.

Replacement Air-Conditioners from Cozy World Inc.

Older models of AC units have 6,8 or 10 SEER ratings, and it’s next to impossible to find parts for them on the market. Since the world of air conditioning has changed so drastically, air conditioning units made more than eight or so years ago are very difficult to repair unless the problem is very simple. Modern 13 SEER air conditioners are similarly impossible to match with the lower rated units, which is why its most often simply easier and cheaper to throw out your old and failing unit and replace it with a new one. The following resources may help you with some of the technical information needed to make an informed decision.

The benefits of a new Air-Conditioner:

Older models of Air-Conditioners can be as much as two times as inefficient as modern ones. Even a lower-end new model which operates at 13 SEER uses half the electricity that an older one which operates at below 10 SEER. Currently, 13 SEER is standard minimum enforced by Canadian law, which offers 30% lower cooling bills than previous minimums. A newer 13 or 16 SEER model can reduce cooling expenses by up to 60%, and can double your energy savings. In addition,  replacement may qualify you for Ontario rebates. Before you think about a replacement, consider the current state of your air-conditioner, and it’s efficacy. Some of the benefits of a new unit include:

  • improves your home’s energy efficiency
  • qualifies you for rebates
  • will make up for it’s cost in a few years, depending on how frequently you use it


Assess the Efficiency of Your Current System

If your conditioner is more than eight years old, it’s really not worth it, as any contractor will likely tell you.  On the other hand, you can upgrade and still not experience the fill benefits because of your home’s overall insulation, the duct-work of your home and the condition of your windows. Improving on your home’s insulation may actually offer more benefits than a complete upgrade. Speak to your contractor for more information about your current AC systems and home’s quality.

Cozy World’s high-efficiency Lennox Air-Conditioners Toronto offer the best in industry standards!

Contact us today for an estimate on a new, high-efficiency Lennox Air-Conditioner System. We are your top Lennox Dealers in Toronto and the rest of the Greater Toronto Area, having served the location for over 10 years. Our ennox products offer the best SEER ratings and efficiency.


What is the EPA?

EPA stands for Environmental Protection Agency, and is an agency created for the protection of health and the environment. The EPA is responsible for writing and enforcing regulations designed to protect the environment and limit emissions, and preserve and create a sustainable future.

What does this have to do with HVAC?

The EPA provides a list of all EPA Certified furnaces, air conditioners and other HVAC systems products. When looking for a system, you should ensure that it is certified by the EPA and meets emissions standards which are based on the following criteria: fuel usage, annual average emission rate (lb/mmBtu), maximum heat output rating (Btu/hr), efficiency (%HHV or APUE) and carbon monoxide emissions.

Browse the EPA website for more rules and regulations pertaining to heating and cooling, and check whether your current HVAC system meets requirements for your region.

Read more here.


The AHRI reference number for an air conditioner guarantees it to have Energy Star efficiency, the proper SEER rating, and the right amount cooling. Every new air conditioning unit sold must have the AHRI reference number.

What is AHRI reference number?

A residential central air conditioner has two main parts: the condensing unit installed outside of the house and the evaporator installed inside the ductwork. For an air conditioner to work up to specs or even to work at all, these two components must be properly matched.

Each condenser works properly with only a limited number of evaporator models. Each of the matches has a unique identifier — the AHRI reference number.

Another must have a component of the air conditioning system is air flow. Airflow is provided by the furnace (fan coil, air handler). For most of 14 SEER units and for virtually all higher SEER air conditioners and heat pumps, manufacturers also prescribe the particular furnace (air handler) models to be used. If this is the case, the furnace model is also included in AHRI number.

It brings the total number of must have components to three:

  1. Condensing Unit
  2. Evaporator (coil, blower coil)
  3. Furnace (fan coil, blower coil, air handler)

How To Check AHRI Reference Number?

On the invoice, among other information, you contractor must show three crucial pieces of data –

the model number for the condenser, the model number for the evaporator, and the AHRI reference number.

Before the evaporator gets concealed inside the ductwork for good, check that the model number on the evaporator matches the number on the invoice. Do the same for the condenser.

Go to HRAI Directory. Enter the AHRI reference number from the invoice as shown below. Click “Search”. The site will give you the model numbers for the condenser and for the evaporator, as well as the SEER rating for the air conditioner and its cooling capacity (See the picture at the bottom). The numbers must match the numbers on the invoice. (Symbol * stands for any digit or letter)

As we can see in the picture, this particular AHRI number 3598225 describes a system that also includes the furnace.
About AHRI. It stands for Air-Conditioning and Refrigeration Institute. AHRI is an internationally recognized leader in developing standards for HVAC products, as well as certifying their performance.

AHRI number


AHRI Reference Number
♦ AHRI Air conditioners and heat pumps
Replacing Air Conditioner
Cost of Air Conditioning


AFUE: Annual Fuel Usage Efficiency

What is AFUE?

AFUE stands for Annual Fuel Usage Efficiency, and is a means of showing how efficiently a furnace transfers heat from the energy created by burning gas to the area. For every dollar of fuel used by the furnace, this is how much heat is produced to heat your home. Think of it as a a gas mileage, but for your furnace. The higher this number, the more energy-efficient a furnace is, the lower your fuel costs. In Canada, the mandatory minimum for an AFUE rating is 90%, meaning that only 10% of the energy can be lost.

Generally, less efficient furnaces are simply older models which inefficient burners, air leaks or less-advanced design.

So what does this mean?

Well, for example, our top of the line Lennox SLP98 furnaces have a AFUE of 98%, meaning they are among the most energy efficient in their class. This rating is important to consider as almost half the energy used within your home will go to heating and cooling. If you have an older furnace with a lower AFUE rating such as 85%, you will be paying for that extra 15% out of pocket, while experiencing poorer heating capacities.

In order to minimize energy waste, and the resulting extra money spent, it is important to consider products with high energy efficiency ratings. An industry leading residential furnace of the most efficient models can save you hundreds of dollars a year when compared to an older, less-efficient one.

Calculate your savings here:

Lennox’s website offers a handy calculator which allows you to figure out how much money you could potentially save with a furnace replacement.

Find out how much you can save here!

Also remember to keep in mind that the government of Canada offers rebates on many high-efficiency furnace replacements. Take a look at the rebates offered, and start saving on energy today. Please also feel free to contact Cozy World to learn more about our financing options, energy-efficient furnaces, air conditioning units and how you can benefit from a home HVAC upgrade.

What is a SEER rating?

What does SEER Stand for?

The SEER rating of  of a n appliance can tell how much heat an air conditioner moves out of the house per watt of electricity used. The higher your SEER rating, the higher the efficiency of the air-conditioner. BTU or the amount of heat moved per hour, and is represented by BTU/hr.

What is it used for?

SEER ratings help when comparing two or more air conditioners. The higher SEER the more efficient the air conditioner. The spreadsheet below shows cost of air conditioning with different SEER rating.As an example, we’ve accumulated the following for comparison:

The cost of electricity is assumed 6 c/kW. The amount of heat produced by different physical objects is in BTU/hr. All the numbers are approximate.

A human body:
-Resting – 350
-Hard Working – 2,000

A regular 100 W bulb – 340

A kitchen stove:
– A small burner – 5,000
– A Large burner – 20,000
– An oven – 20,000

A computer – 1000

Example 1

The size of your air conditioner is 1 ton. How much does it cost you to run your air conditioner for 1 hour?
One ton of cooling is 12,000 BTU/h. After we enter 12000 into the spreadsheet, it returns us the cost 9 cents an hour for an old 8 SEER air conditioner and 5.14 cent for a Energy Star 14 SEER air conditioner.

Example 2

A 3 ton air conditioner runs on average half of the time around the clock. How much electricity does it use?
Since one ton of cooling removes 12,000 BTU/h of heat, we enter 12,000×3=36,000 into the spreadsheet. It returns 27 cents an hour for the old air conditioner, 13.5 for the new and 15.43 for a mainstream 14 SEER unit. With this numbers the old unit costs $0.27x24x0.5=$3.24 a day to run. The 16 SEER unit costs $1.62 and the 14 SEER unit costs $1.85 a day to run.

Example 3

You are planning a party for 10 people. The party will last 4 hours with some activities, like dancing – 800 BTU/h per person. Total 800 x 10 x 4 = 32,000 BTU One hour of cooking will precede the party. Oven and 2 large burners will produce 20,000 x 3 = 60,000 BTU. All the extra heat in the house will total 92,000 BTU.

Cost of cooling is 69 cents with an old air conditioner and 39.4 cents with 14 SEER new one. Perhaps you can afford cooling of your party if you can afford the party itself.

One more consideration:

While cooking you will need 60,000 BTU/h EXTRA cooling capacity, and this is 5 ton of cooling – the size of the biggest residential unit on the market. You do not have that much EXTRA cooling available. The most effective way to fight cooking heat and moisture would be using of the kitchen exhaust fan.

Extra heat from 10 people will require less than 1 ton of cooling . Most probably your air conditioner will be able to handle it if it’s not too busy fighting sun load.

ARI Reference Number
Replacing Air Conditioner
Cost of Air Conditioning