Answers for the trades, with the math shown.
Pricing, sizing and dispatch questions, answered in plain language with worked examples and free calculators.
Sunwell guides answer the pricing, sizing and dispatch questions contractors ask most, with worked examples and free calculators. Each guide starts with a short answer, then shows the math.
- Roofing: squares, pitch, pricing and good, better, best proposals
- HVAC: tonnage, SEER2 and financing options
- Plumbing: flat rate pricing and after-hours dispatch
- Electrical: panel upgrades and load calculations
How do you calculate roofing squares?
A roofing square is 100 square feet of roof. Learn the footprint, pitch factor and waste steps, with a worked example, bundle counts and ordering tips.
Read the guideGuideWhat is roof pitch and how does the pitch multiplier work?
Roof pitch is rise over a 12 inch run. See the pitch multiplier table, how to measure pitch, and how pitch changes roof area, with a worked example.
Read the guideGuideHow do you price a roof replacement estimate?
Build a roof replacement price from squares, materials, labor, disposal and permits, then price to a target margin. Includes a worked example with the math.
Read the guideGuideHow do you write a good, better, best roofing proposal?
How to build and present three roofing options homeowners understand, with what to change between tiers, a priced example and the pitfalls to avoid.
Read the guideHow is AC tonnage sized, and why does Manual J matter?
One ton of AC is 12,000 Btu per hour. Learn how to size a system from a Manual J load calculation instead of square feet per ton, with a worked example.
Read the guideGuideWhat is SEER2 and what SEER2 rating do you need?
SEER2 is the current efficiency rating for central air conditioners and heat pumps. See DOE minimums by region, what the number means and a cost example.
Read the guideGuideHow do you present HVAC options with financing?
Show good, better and best HVAC systems with monthly payments. Learn the loan payment formula, a worked example and how to explain interest and terms.
Read the guideIs flat-rate or time-and-materials pricing better for plumbers?
Compare flat-rate and time-and-materials pricing for plumbing jobs, with a worked water heater example showing price, cost and margin under each method.
Read the guideGuideHow do you run emergency and after-hours plumbing dispatch?
Build an after-hours plumbing dispatch playbook: triage, on-call rotation, response targets, dispatch fees and a worked monthly cost example.
Read the guideHow do you estimate a 100A to 200A panel upgrade?
How to scope and price a 100 amp to 200 amp service upgrade: load check, permit, utility coordination, inspection steps and a worked estimate with the math.
Read the guideGuideHow do you do a residential electrical load calculation?
How to size a home's electrical service with the NEC 220.82 optional method: general loads, demand factors, A/C, and a worked example in amps.
Read the guideYou shouldn't pay for software you don't use. So every team gets a quote built for it.
What happens next
- 1A written quote in one business day
Sized to your team, locations and what you turn on.
- 2A walkthrough on your own data
See your jobs and pricebook on the board, not a demo account.
- 3We move you over
Customers, jobs and pricebook imported, office and crews trained. Guided setup always included.