Heating and cooling

The house size and age, your climate, and the equipment now.

• Attach your Sheet so people see your sizes and the math.
• Your town is enough. Never your address; check photos for house numbers and plates.
• Is it safe? A safety question here goes to pros verified in heating and cooling, unless you pick another trade. Only they can call it safe or unsafe.

2000 sq ft, furnace + AC: a rough heat loss of 37,200 BTU/h and heat gain of 26,100 BTU/h, a cross-check before the room-by-room Manual J.

What people get wrong:

• Sizing by the square foot. Rules like 500 sq ft a ton oversize most houses: short cycles, clammy air, cold and hot rooms.
• Starving the return. One small return chokes the blower: high static pressure, noise, and a frozen coil or an overheated heat exchanger.
• Sagging, kinked flex. Every sag and sharp bend cuts the airflow.

The worked example, every line's math and the code notes · Your own sizes in the app

• Circuits and wiring: New circuits, wire sizes and breaker loads
• Panels and service upgrades: Panel swaps, 100 to 200 amp upgrades and subpanels
• Outlets, switches and lights: Outlets, GFCIs, switches and light fixtures
• EV chargers: Home EV charging: circuits, panels and permits
• Generators and solar: Backup power, transfer switches and solar
• Smoke and CO alarms: Where alarms go, hardwired or battery, and chirping
• Plumbing rough-in: Supply and drain layouts, pipe sizes and venting
• Water heaters: Tank, tankless and heat pump water heaters
• Leaks and clogs: Leaking pipes, slow drains and clogs
• Gas lines and appliances: Gas piping, ranges, dryers and smells
• Wells and water quality: Wells, softeners, filters and water pressure
• Heat pumps and mini-splits: Ducted and ductless heat pumps
• Ducts and airflow: Hot and cold rooms, duct sizes and returns
• Boilers and radiators: Hot water and steam heat
• Smart home and low voltage: Thermostats, cameras, doorbells and network wiring
• Every group

• Open to read from anywhere, no account needed.
• Sign in with your email to ask, answer and vote. No password.
• The best answers rise: votes, “worked for me” and a solved mark. Verified pros carry a badge.

Questions? Write to support@studsheet.com.