WebMD Symptom Checker helps you find the most common medical conditions indicated by the symptoms lump or bulge, muscle cramps or spasms (painful) (upper arm (bicep)), muscle cramps or spasms (painful) (fingers) and muscle twitching (painless) including Hypocalcemia, Muscle strain, and Low potassium (hypokalemia).
What causes condensation in AC ducts? A: Condensation in AC ducts can be caused by improperly sealed openings or a lack of proper insulation around the AC duct. Condensation occurs when the outer portion of the duct work is cooled down and comes into contact with warmer air, according to Ace Plumbing.
Low duct temperatures can result in condensation, which can accumulate during the winter months. According to NAIMA, the source of liquid water in unused or nonoperating ducts is the air within a home. All air contains some water in the form of water vapor.