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For hvac technicians

Invoice and estimate app for HVAC

Quote the install, invoice the service call, and bill maintenance plans on a schedule, all from the truck.

Coming soon to the App Store

PRO marks a Sumocat Pro feature. Everything else is free.

Northwind Heating and Air
Invoice #302
Amount due
CA$436.80
Billed to
Ridgeline Roofing
accounts@ridgeline.co
Issued Nov 3, 2026
Due Nov 17, 2026
ItemAmount
Furnace tune up1 visit × CA$149.00CA$149.00
Replacement filter2 ea × CA$28.00CA$56.00
Igniter replacement, labor1 hr × CA$125.00CA$125.00
Hot surface igniter1 ea × CA$86.00CA$86.00
SubtotalCA$416.00
GST (5%)CA$20.80
TotalCA$436.80

How to make an invoice as an HVAC technician

  1. 01

    Add up the job on the calculator

    Type each amount, or work it out with × (hours times rate, area times price), and tap the lines key to add it.

  2. 02

    Turn it into an invoice

    Pick Invoice and tap the action key. Name each line, set units and taxes, and pick the client.

  3. 03

    Send it

    Share the PDF or a link by text or email, then mark it sent. With Pro, email it from the app in one tap.

Built for how hvac technicians work

Maintenance plans on a schedule PRO

Bill a yearly or quarterly plan as a recurring invoice that sends itself.

Install quotes with a deposit

Quote equipment and labor with a deposit due on acceptance and the balance on completion.

Notified when a client acts

Get a push notification when a client views an invoice or accepts an estimate.

Questions

Something else? Write to support@sumocat.app.

Can I bill maintenance plans automatically?

Yes, with Sumocat Pro. A recurring invoice creates each bill on schedule and can email it to the client.

Will I know when a client opens my invoice?

Yes. Sumocat sends a push notification when a client views an invoice or estimate you shared.

Can I use it on more than one phone?

Sign in on each iPhone and your records sync between them, for free.

Add it up. Send the invoice.

Sumocat is free on iPhone, with no account needed to start.

Coming soon to the App Store
  • No caps on invoices or clients
  • Works offline
  • Free cloud sync