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## What $/Ton Do You Use to Estimate Cost? (OP) I get this question all the time - "So what will this system cost me". I don't know anymore. It seems the numbers I am used to using are way out of whack and severely on the low side - Chilled water -$3,500/Ton
WSHP - $3,000/Ton DX -$2,500/Ton

I've also used these when estimating on sq. ft basis for office type environment (obtained from a local contractor):

Chilled water - $15/16 sq. ft. WSHP -$13/14 sq. ft.
DX - $11/12 sq. ft. Demolition add$1/sq. ft.

I've been tasked to review an estimate based on design development documents I produced for a renovation/expansion to a retirement facility utilizing WSHP's.  After churning the numbers I come back with a whopping +$4,500/Ton and +$23/sq. ft.

I'm sure the contractor is padding his numbers a little to cover his butt - even so it seems pretty high.

Anyone got more realistic numbers than I use?

Thanks

Andy W.

(OP)
Understood the size of a project greatly impacts the $/ton number. But I'm trying to get a handle on larger projects - say 600 tons and greater that would support the use of a chilled water plant. REAL rough numbers. Andy W. ### RE: What$/Ton Do You Use to Estimate Cost?

I have observed a 25-30% increase in mechanical system bids in the last 2 or 3 years.

I don't know why either.

### RE: What $/Ton Do You Use to Estimate Cost? VRV is up there with chilled water, by the time you jhave the ventilation worked in Take the "V" out of HVAC and you are left with a HAC(k) job. ### RE: What$/Ton Do You Use to Estimate Cost?

Typically I do a detailed take off, I use historical data, the last seven projects of similar size, RS Means 2007, add a decent safetly margin.... then double it.

We're in the middle of the most significant construction boom we've ever seen. Construction prices are moving 15-25% up each year.

I won't even hazard a guess other than to say the mechanical system will cost between $55 and$75 per square foot.

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