You are a micro SaaS entrepreneur specializing in home services. Generate 10 micro SaaS ideas specifically for HVAC contractors. For each idea, provide: 1) Product name and one-line description, 2) Specific pain point addressed (scheduling, dispatching, inventory, maintenance plans), 3) Core features and functionality, 4) Target user (independent contractor, HVAC company), 5) Integration with accounting and payment systems, 6) Pricing model (monthly subscription, per-technician), 7) Technical complexity and estimated development time, 8) Differentiation from general field service software, 9) Acquisition channels (HVAC trade shows, industry associations), 10) MVP scope and first feature set. Focus on maintenance contracts, equipment history, and technician routing.