We just had two WF S7 3-ton units installed with our new geo system and live in Maryland outside of DC. The contractor did a Manual J to size the units for our 5-level split roughly 5k sf house. Basement unit has 2 zones approximately equal square footage. The garage unit has 3 zones of varying size. Since installation, the basement unit primarily (and the garage unit to a lesser degree) will ramp up to second stage for the last 20 seconds of most cooling cycles prior to shutting off. Always the same 20 second time duration, only occurs at the end of a cycle. Otherwise during cooling cycles we do not hear the units running but are often distracted by the significant increase sound in air movement and, depending on where we are in the house, sound from the units themselves. Overall, the units do a fine job cooling the house and humidity is well controlled. The contractor made some adjustments initially that seemed to make the 20 second ramp up stop occurring, during which time the unit would go from its normally near silent operation to off at the end of a cycle. After 2 days the ramp ups resumed. The contractor is coming back out to look again, but made a comment about how it may be the result of one zone being on and the other zone off or the unit cycling oil as part of its standard maintenance, but they will look more closely when they are out next week for our final walk through. Is this 20 second ramp up in the unit prior to ending a cycle normal? Do the possible causes mentioned by the contractor sound plausible or is something else more likely? Thanks for any feedback.