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Recommended Air Conditioner Size |
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Bungalow |
Built after year 1980 |
Built before year 1980 |
Up to 1,200 sq-ft |
1.5-ton |
up to 2-ton |
1,200 to 1,500 sq-ft |
2-ton |
2-ton |
1,500 to 1,800 sq-ft |
2-ton |
up to 2.5-ton |
1,800 to 2,500 sq-ft |
up to 2.5-ton |
2.5 to 3-ton |
2,500 to 3,500 sq-ft |
3 to 3.5-ton |
3.5 to 4-ton |
Semi-Detached 2-Storey Home |
Built after year 1980 |
Built before year 1980 |
Up to 1,500 sq-ft |
1.5-ton |
up to 2-ton |
1,500 to 1,800 sq-ft |
up to 2-ton |
2-ton |
1,800 to 2,200 sq-ft |
2-ton |
up to 2.5-ton |
2,200 to 3,000 sq-ft |
2.5-ton |
2.5 to 3-ton |
Detached 2-Storey Home |
Built after year 1980 |
Built before year 1980 |
Up to 1,300 sq-ft |
1.5-ton |
up to 2-ton |
1,300 to 1,700 sq-ft |
1.5-ton |
2-ton |
1,700 to 2,500 sq-ft |
2 to 2.5-ton |
2.5-ton |
2,500 to 3,500 sq-ft |
2.5 to 3-ton |
3 to 3.5-ton |
3,500 to 4,500 sq-ft |
3.5 to 4-ton |
4 to 5-ton |
Ottawa East | ||
K1B | Ottawa Center | |
K1C | K1R | |
K1E | K1S | |
K1G | K1X | |
K1H | K1Y | Ottawa West |
K1J | K2A | K1T |
K1K | K2B | K1V |
K1L | K2C | K2H |
K1M | K2E | K2J |
K1N | K2G | K2K |
K1T | K2P | K2L |
K1V | K4K | K2M |
K1W | K4M | K2R |
K4A | K4P | K2S |
Furnace Output [BTU] Required |
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Bungalow |
Built after year 1980 |
Built before year 1980 |
Up to 1,200 sq ft |
40,000 BTU |
50,000 BTU |
1,200 to 1,500 sq ft |
50,000 BTU |
55,000 BTU |
1,500 to 1,800 sq ft |
55,000 BTU |
60,000 BTU |
1,800 to 2,500 sq ft |
65,000 BTU |
70,000 BTU |
2,500 to 3,500 sq ft |
80,000 to 90,000 BTU |
90,000 to 100,000 BTU |
Semi-Detached 2-Storey Home |
Built after year 1980 |
Built before year 1980 |
Up to 1,500 sq ft |
40,000 BTU |
50,000 BTU |
1,500 to 1,800 sq ft |
50,000 BTU |
55,000 BTU |
1,800 to 2,200 sq ft |
55,000 BTU |
60,000 BTU |
2,200 to 3,000 sq ft |
60,000 BTU |
70,000 BTU |
Detached 2-Storey Home |
Built after year 1980 |
Built before year 1980 |
Up to 1,300 sq ft |
40,000 BTU |
50,000 BTU |
1,300 to 1,700 sq ft |
45,000 BTU |
up to 55,000 BTU |
1,700 to 2,500 sq ft |
55,000 BTU |
Up to 65,000 BTU |
2,500 to 3,500 sq ft |
Up to 65,000 BTU |
Up to 80,000 BTU |
3,500 to 4,500 sq ft |
Up to 80,000 BTU |
Up to 100,000 BTU |
*The above square footage do not include the area of the basement.
Please note that, installing an over-sized furnace will be less efficient, too noisy and will result in imbalanced temperature around the house. Also, an over-sized furnace will run in shorter cycles, hence reducing furnace life.
Size of Cabin Filter depends on volume flow of the Blower Motor as shown below. Volume flow is usually measured in Cubic Feet per Minute (CFM). |
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Furnace Max Air Flow: |
Minimum Filter Cabin Size |
Recommended Filter Cabin Size |
up to 800 CFM |
16 × 25 × 1 |
16 × 25 × 5 |
up to 1200 CFM |
16 × 25 × 1 |
16 × 25 × 5 |
up to 1600 CFM |
20 × 25 ×5 |
20 × 25 × 5 |
up to 2000 CFM |
20 × 25 × 5 |
20 × 25 × 5 |
5” Media Air Cleaner and 1” Filter Compared |
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5” Media Air Cleaner |
1” Filter |
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MERV (ability to capture particles) |
MERV 11 |
MERV 8 |
MPR (ability to capture particles) |
1200 |
300 |
Restricts air flow |
low |
high |
Replacing time |
Every 6 months |
Every 2 months |
Effect on furnace efficiency |
Increases furnace efficiency |
Reduces furnace efficiency |
Price |
$49/filter → $98/year |
$19/filter → $114/year |
ECM, DC motor furnace |
Increases the efficiency and life-span of the furnace |
Furnace not working well, more service call, Reduces efficiency |
Undersized filter will result in: