How big a chiller does your reservoir actually need?
Answer five questions about your setup and get an estimated cooling load in BTU per hour, plus the chiller class that typically covers it.
Includes 20% headroom
A chiller isn't sized off gallons alone. It has to remove heat as fast as heat gets added. Four things add heat to a reservoir, and they stack.
Warm water holds less dissolved oxygen, and roots that are starved for oxygen absorb nutrients poorly no matter how dialed in your feed schedule is. Water sitting above 75 to 78°F for extended periods is also the range where pythium and other root pathogens thrive. Below 60°F, nutrient uptake slows down instead. The 65 to 68°F band is the balance point most crops handle well.
Most crops tolerate up to 72 to 74°F without issue. If your reservoir consistently runs hotter than that, or you're seeing slow growth and root problems you can't otherwise explain, a chiller is worth adding.
Not really. An oversized chiller short-cycles, turning on and off more than it should, which wears the compressor faster and doesn't hold temperature any tighter. Matching the load is the goal, not maxing it out.
Yes. Growers in cold rooms or with wide day and night swings often run both on a dual-stage controller so the reservoir holds a tight range in either direction.
Yes, noticeably. In the estimate above, insulation cuts the ambient heat gain roughly in half, which is often enough to drop you a full chiller size and save real money up front.
Call us with your gallons, temps, and equipment list. We'll compare it against what's actually in stock and tell you straight which one fits, instead of guessing on a borderline case.