Tech found system short cycling due to water pooled inside return. Tech took door off of crawlspace and found crawlspace partially flooded. Return is 16” flex duct. Tech did not crawl through the water to measure return length. Tech estimates 20 to 25 feet. Due to condition and water damage, tech recommends replacing duct system and adding a sump pump under the house to keep ductwork dry. Tech passed info to Gina in the office. Left heat strip and heat pump breakers off.