What SEER rating should I look for in an AC

For Ottawa's climate, look for a SEER rating of 16-18 for the best balance of efficiency and value. Higher SEER units (20+) are available but may not provide enough additional savings to justify the extra cost in our moderate cooling season.

SEER (Seasonal Energy Efficiency Ratio) measures how efficiently your air conditioner uses electricity over a typical cooling season. The higher the number, the more efficient the unit. In Canada, we also use EER (Energy Efficiency Ratio) ratings, but SEER gives you a better picture of real-world performance across varying temperatures.

A 16 SEER unit uses about 25% less electricity than the old 13 SEER minimum, which can save you $200-400 per year on cooling costs depending on your home size and usage. An 18 SEER system pushes those savings even higher while still being reasonably priced. Going beyond 18 SEER often means variable-speed technology and advanced features that work well but come with a premium price tag.

In Ottawa's climate, we typically see 3-4 months of significant AC usage, so your payback period on higher efficiency units is longer than in hotter climates. However, with rising electricity rates and increasing summer temperatures, investing in a 16+ SEER system makes good financial sense. These units also tend to have better humidity control and quieter operation.

Look for ENERGY STAR certified models and consider the warranty coverage - higher SEER units often come with better warranties. Also factor in your home's insulation, ductwork condition, and size when choosing capacity. An oversized high-SEER unit that short-cycles will perform worse than a properly-sized moderate-efficiency system.

For a personalized recommendation based on your home's specific needs and cooling load calculation, request a free consultation from Ottawa HVAC Pro.

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