Verify if the manufacturer's warranty remains valid if you purchase online and install it yourself. Many brands require installation by a licensed HVAC professional to keep the warranty intact.
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Buying the wrong size is the most common mistake. A general rule is 20 BTUs per square foot . 5,000 – 8,000 BTU: For rooms 150 to 350 sq. ft.. 8,000 – 12,000 BTU: For rooms 350 to 550 sq. ft.. Verify if the manufacturer's warranty remains valid if