Actually it is hard to say. We need more info.
For example, my first SW tank was a 28G JBJ, with a full covered top. The heat didn't escape with the 150W Halide, and that caused heat build up, so I needed a chiller. but with my 180G with 100G sump, I do not as it is an open top. I don't even use heaters, as my house is climate controlled which keeps my tank stable as well.
So it will depend on your setup, if you cover, type and volume of flow, and well many factors.
So I can't vote, as you don't have Maybe as an option.
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Setup: 180G DT, 105G Refuge (approx. 300lbs LR, 150lbs Aragonite)
Hardware: Super Reef Octopus SSS-3000, Tunze ATO, Mag 18 return, 2x MP40W, 2X Koralia 4's Wavemaker
Lighting: 5ft Hamilton Belize Sun (2x250W MH, 2X80W T5HO)
Type of Aquarium: mixed reef (SPS & LPS) with fish
Dosing: Mg, Ca, Alk
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