Yes, I’ve had experience with cleaning ventilation in a condo, and it definitely made a noticeable difference. Over time, dust, mold, and debris can accumulate in your ducts, reducing airflow and air quality. That “heavy” air feeling you mentioned is a common sign. I went through something similar and ended up contacting a Cleaning company Sharjah residents recommended. They handled the duct and vent cleaning professionally, and the air felt noticeably fresher afterward. I’d suggest looking for companies that specialize in HVAC or duct cleaning. Many offer free inspections, so it’s a good way to get started.