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As a general rule, you need about 20 BTUs per square foot. A 200 sq ft room needs approximately 4,000-5,000 BTUs, a 400 sq ft room needs 8,000-10,000 BTUs, and a 500+ sq ft room needs 12,000-14,000 BTUs. Add 10% for sunny rooms or kitchens.

Most window AC installations are DIY-friendly. You'll need another person to help lift the unit, basic tools, and about 30-60 minutes. Ensure your window can support the weight and that you have an appropriate electrical outlet nearby.

Some brands like Mr. Cool offer DIY-friendly systems with pre-charged line sets that don't require an HVAC license. However, most mini splits require professional installation for proper refrigerant handling and to maintain warranty coverage.

HEPA filters typically last 6-12 months depending on usage and air quality. Carbon filters usually need replacement every 3-6 months. Pre-filters should be cleaned monthly and replaced when worn. Most purifiers have filter replacement indicators.

SEER (Seasonal Energy Efficiency Ratio) measures AC efficiency. The minimum for new units is 14 SEER. We recommend 16+ SEER for moderate climates and 18+ SEER for hot climates where AC runs frequently. Higher SEER costs more upfront but saves on energy bills.