Techs and contractors
The customer asks something you can’t quite answer. Get code-aware, equipment-specific answers in seconds, without breaking eye contact to Google it. Talk it through hands-free with voice, or point your camera at it.
YOUR NEXT STEP STARTS HERE
Your AC just quit.
Get a pro’s take
in seconds.
Troubleshoot a problem, size a system, decode a model number, or check your local code by text, voice, or photo. Built by working HVAC pros at ProCalcs.
Building-code lookups work in text chat and voice calls. Include your city, state and code edition, if known. Voice is included with Plus and Professional.
Create a free account to get 10 questions total. No credit card.
7-day free trial on paid plans for first-time subscribers.
No ads, no trackers. Your questions stay private.
FOR HOMEOWNERS
It’s 95°F, the AC stopped,
and the tech can’t come till Friday.
Find out whether you can fix it, wait it out, or push for an emergency visit. Ask in plain words, or snap a photo of the thermostat, unit, or data plate. You’ll get safe things to check first, and an honest heads-up when it’s a job for a licensed tech.
- Troubleshoot what’s going on, step by step
- Decode the model number on your equipment
- Make sense of a contractor’s quote with the quote analyzer (Plus)
- Keep your equipment profile and get monthly alerts (Basic and up)
FOR PROS
Built for solo techs
and small shops.
Builders
The ductwork doesn’t fit, and the plans said it would. Get workable options for the field decisions that never make it into the drawings, before they turn into expensive change orders.
Architects
Mechanical problems shouldn’t show up late in design. Get HVAC inputs early: mechanical room sizing, ceiling clearances, and the right questions to bring to the MEP meeting.
Professional: 180 voice minutes/month. No monthly question-count cap; a $10 daily AI-cost ceiling applies. This is a usage limit, not an extra charge.
Try it free · Compare plansSAMPLE QUESTIONS
Good questions.
Useful next steps.
Examples. Real answers vary with your system and details.
Homeowner
“Outdoor unit is running but the vents blow warm air. What can I check myself?”
ANSWER EXCERPT
Check the thermostat (Cool, fan on Auto, set 5° below room temp, fresh batteries). Then check the filter and return grilles, look for ice on the copper line (if there's ice, turn cooling off and run the fan to thaw), and check the breakers and the service switch. If nothing changes, it's likely a tech job: a refrigerant leak, a failed outdoor part, or a drain/airflow issue.
Technician
“Customer asks why their 4-ton two-stage system never runs high stage at 88°F.”
ANSWER EXCERPT
On a properly sized two-stage system, that's often normal, because high stage is for peak-load days and recovery. Confirm the thermostat staging logic, then verify 24V at Y2 on a forced test call before suspecting wiring or setup.
Builder
“Drawings call for a 14x8 trunk in a 10-inch joist bay. Framers are already up.”
ANSWER EXCERPT
Options: switch that segment to a wider, shorter (or approved oval) profile, drop it into a soffit or chase, or split it into two parallel trunks. Size the bay for duct + insulation + hangers + access.
Architect
“Heat pump on a 4,200 sq ft home in zone 5A, 75% CDs. What room size and clearances should I plan for?”
ANSWER EXCERPT
Planning targets should follow the Manual J load and the selected equipment. The answer covers what to reserve now and which questions to bring to the MEP engineer.
Ask Your HVAC Pro gives guidance, not an inspection. For gas, electrical, or safety issues, call a licensed tech.
Built by working HVAC pros at ProCalcs.
Florida · Practical HVAC experience, brought into the conversation.
FAQ
A few things to know.
Do I need to sign up?
Yes. Create a free account to get 10 questions total. No credit card. An account is required to ask any question.
What can I ask?
Ask about HVAC troubleshooting, system sizing, equipment details, and building codes. Text, voice, photo and specialist tools depend on your plan.
Can I ask building-code questions by voice?
Yes. Building-code lookups work in text chat and voice calls. Include your city, state and code edition, if known. Voice is included with Plus and Professional. Verify requirements with your local building department before acting.
Is there a free trial?
First-time subscribers get 7 days free on any paid plan. We collect your card when you start a paid plan but don't charge it until the trial ends. Creating a free account never starts a trial or requires a card.
How do I cancel?
Anytime, in Settings → Manage Subscription. Cancel before the trial ends to avoid a charge. Otherwise you keep access through the period you have paid for.
How does billing work?
Paid plans renew automatically each month or year. Annual plans are charged once a year. Your first charge happens when the 7-day trial ends, unless you cancel before then. Returning subscribers who have used their trial are charged when they subscribe.
What if I forget to cancel?
Email tom@procalcs.net within 7 days of your first charge to request a full refund, with no usage limit.
Do you give refunds otherwise?
Later charges and requests after the 7-day window are non-refundable except where required by law. Cancel anytime to stop the next charge.
How do I upgrade?
Choose a plan on the pricing page. Create your account and verify your email, then continue directly to Stripe checkout. Already subscribed? Manage your plan in your account.
How can I ask?
By text on every plan. Voice comes with Plus and Professional. Camera diagnosis comes with Plus and up.
Who built this?
Built by working HVAC pros at ProCalcs.
Do you use advertising trackers?
No ads and no advertising trackers. We use first-party account and usage data to operate the service.
Does this replace an inspection?
Ask Your HVAC Pro gives guidance, not an inspection. For gas, electrical, or safety issues, call a licensed tech.