01 / Load calculation
Manual J, whole house
Room-by-room heat-loss + heat-gain calculation per ACCA Manual J. Inputs: orientation, envelope, windows, infiltration, internal gains. Output: the actual BTU demand in January and July.
Denver metro · residential + light commercial
Heating and cooling, engineered to the house.
Every install starts with a Manual J heat-load calculation. Every estimate shows you the math. The mechanical contractor you actually want doing the work, precise, efficient, and bored of selling you tonnage you don't need.
Licensed CO-MP-2215
NATE certified
EPA 608 Type II
IRA rebate registered
Proposal / example
CS-2026-0418
2,400 sf ranch, Wash Park
Heat load42,100 BTU/h
Cool load27,800 BTU/h
Recommend3-ton heat pump + 60k BTU backup
EquipmentMitsubishi P-Series · 19 SEER2
IRA credit$2,000 (25C) applied
Xcel rebate$1,800 pre-qual
Install time2 days, crew of 3
How we scope a job
Three steps, no guessing.
Most HVAC estimates you've seen were generated from a square-footage rule of thumb and the equipment sitting in a warehouse. Ours aren't. Here's the actual process.
02 / Equipment match
Right size, right SEER2
Equipment chosen to match the load (within 15% oversize max, per best practice). SEER2 rating selected against your goals, lowest bill, highest comfort, or fastest payback. Every option costed separately.
03 / Line-item estimate
Transparent scope, signed
Fixed-price estimate. Equipment model numbers, install hours, permit fees, post-install commissioning, and warranty terms, all broken out. No "miscellaneous" line. No change orders without your sign-off.
Proof in the numbers
Eight years, 412 installs, zero cut corners.
412
Residential installs since 2018
15%
Max oversize vs. Manual J
4.9
Google rating · 127 reviews
2yr
Workmanship warranty · 10yr parts
What customers say
Engineers love us. So do homeowners.
Three other companies bid 5-ton units. Summit did a Manual J and quoted me a 3-ton with a backup coil. Eight months in, the house holds temperature better than it ever did with the old oversized furnace, and my bill is down 34%.
I'm a mechanical engineer and I've seen a lot of HVAC estimates. Summit's is the only one I've ever received that included a proper load calc and itemized the IRA credits correctly. That kind of rigor is rare at residential scale.
Our 1952 bungalow had weird duct runs and two previous contractors had quoted us "retrofit's going to be messy." Summit's install team rerouted three trunks cleanly and got commissioning to balance within 2 CFM of design. Dust it took, drama it didn't.
Furnace quit the morning of a -6°F day. I called Summit at 6:45 am, technician was on-site by 9, diagnosed a pressure-switch issue, had it running by 11:30. No upsell, no "you should really replace the whole thing." $280. Done.
Ready for a real estimate?
Free load calculation and itemized proposal on qualifying residential projects. Most estimates scheduled within 4 business days.