I believe there was a reference to coolers (versus just a single unit).
The Peltier coolers are going to be internal (cooling the liquid coolant and exchanging the heat across the intake port on the GF 
)
Since the intake air goes across the crumb tray and out the exhaust, but the coolant cycles through the reservoir and through the glass tube, that will keep the liquid below the approximate 90 Degree (F) operating limit.
@dan references the coolant for temp monitoring
Continuing the discussion from Pro Heat Limits: