hey edux10,
This thread posted may be of some help:
https://www.rollitup.org/hydroponics-aeroponics/72438-hydroponic-chillers.html
heres what I could dig up for you.
If you do end up going for the ice probe get it from here its only $100.00!!!!
IPWC-50' Includes 50 watt thermoelectric water chiller...
heres the quoted caption regarding the chiller:
"In typical aquariums. one IceProbe can reduce the temperature of 10 gallons of water 6 to 8 F. 20 gallons of water 3 to 4 F. and 40 gallons of water 1 to 2 F. Multiple IceProbes are commonly used in aquariums over 20 gallons to achieve higher temperature differentials.
NOTE: This chiller does not include a controller. Usually if the chiller is cooling the water too much you can just set your heater up a little to compensate. They do offer an optional controller."
So 6 to 8 degress for 10 gallons, well since your only working with 1.5 gallons it may or may not be good for you, as I dont know if its capability under even lighter loads that 10 gallons can go cooler.
You could get 2 of them, seeing as they are only $100 a piece,
Doing a little research has told me that it is difficult to chill a resovoir that is only 1.5 gallons, as most flow 5 gallon per minute, this would mean needing to keep extra water in the system, to account for the water going in the resovoir and out of it into a standing unit chiller.
therefore the ICE PROBE is probally your best bet!.
I would get two of them and hopefully, PRAY TO GOD this gets you down to low 70 degress in there.
But remeber you are trying to cool a cloner, this is new, I have never seen anyone need to do so!!! Is there any way you can just relocate the cloning room to another area of the location?
Again here is the link for a $100 ICE probe (please ignore my previous post, and do not buy from texas hydro.
IPWC-50' Includes 50 watt thermoelectric water chiller...
I hope my post was helpful!!!