I agree with Tony on spending small dollars (relative to your investment) on a heater for more stable temp. When the heater is not needed and not running, great, no power consumption.
Speaking of summer heat coming, has anybody found a good deal on a chiller$$$$$$
Regarding pump noise part-2, the baffle idea will have very limited success based on my past similar problems and opinions from various pump sales people. I still recommend spending some time with various mounting ideas of the pump before constructing baffles. Sometimes an enclosure with act like a skeaker box. Believe it or not, a Little Giant noise machine can be defeated
Oh, don't bother trying egg cartons
kari