Software as a service (SAAS) services featuring software for assessing, recommending, pricing, and providing cost estimates for HVAC units, projects and installations; Providing temporary use of non-downloadable cloud-based software for assessing, recommending, pricing, and providing cost estimates for HVAC units, projects and installations; Software as a service (SAAS) services featuring software for selecting, purchasing and ordering HVAC units; Software as a service (SAAS) services featuring software for invoicing customers, fulfilling and managing customer orders, and facilitating electronic commerce transactions and payment processing; Software as a service (SAAS) services featuring software for scheduling, managing and fulfilling HVAC installation services; Providing temporary use of non-downloadable cloud-based software for selecting, purchasing and ordering HVAC units; Providing temporary use of non-downloadable cloud-based software for invoicing customers, fulfilling and managing customer orders, and facilitating electronic commerce transactions and payment processing; Providing temporary use of on-line non-downloadable software for scheduling, managing and fulfilling HVAC installation services; Providing temporary use of on-line non-downloadable software for generating custom price quotations and facilitating electronic commerce transactions; Platform as a service (PAAS) featuring computer software platforms for capturing and analyzing HVAC pricing data to predict installation costs and calculate retail prices; Platform as a service (PAAS) featuring computer software platforms for facilitating communications, data sharing, and e-commerce services within the HVAC industry