This is good stuff.
You do not need a large dehumidifier. I suggest an Ultra-Aire 90H which is small and much more efficient.
Capacity @ AHAM: 150 Pints/Day
Capacity @ Saturation: 265 Pints/Day
Amp Draw: 14 Amps
CFM: 500 CFM
Operating Temp. Range: 40° - 150°F
Warranty: 5-Year Factory Warranty
Sound Level: 53 dBA Ducted, 67 dBA Non-ducted
Capacities and Performance
Part Number: 4029820
Blower: 240 CFM @ 0 WG
Supply Voltage: 110 -120 Volt, 60 Hz
Energy Factor: 2.5 liters/kWh
Efficiency: 5.3 pints/kWh
Operating Temp.: 56°F Min, 100°F Max
Sized For: 2200 Sq. Ft. - Typical
Capacity: 90 Pints/Day (80°F, 60% RH)
Connections: 6" Round Inlet
10" Round Inlet
10" Round Outlet
Filter Efficiency: Standard MERV-11
(65% ASHRAE Dust Spot)
Power Cord: 7.5', 115V With Ground
Drain Connection: 3/4" Threaded NPT
Oversized dehus are like oversized a/C. They are best sized to avoid short cycling for efficiency and long cycles during peak loads. Short cycling involves re-evaporation of moisture on the coil back to the space. Plus the top unit uses 14 amps verses 6.7 for UA 90H. Also the UA is much more efficient than the other. Your contractor can purchace the UA from a local wholesaler or from the factory. I have worked for UA +20 years, developing the concept of the ventilating dehu.
Any dehu is better than no dehu, but get the best you can. UA is the most efficient and durable.