# hvacnotheating.com ## Posts - [EPA 608 Certification vs. an HVAC License: What Is the Difference?](https://hvacnotheating.com/epa-608-certification-vs-hvac-license/): Quick answer: EPA Section 608 certification is a federal refrigerant-handling credential for technicians who service stationary air-conditioning and refrigeration equipment. - [EPA 608 Test Passing Score: What You Need to Know Before Test Day](https://hvacnotheating.com/epa-608-test-passing-score/): Quick answer: EPA 608 closed-book tests use a 70% passing threshold. The Type I mail-in/open-book format uses 84%. - [Can You Buy Refrigerant with an EPA 608 Certification Card?](https://hvacnotheating.com/buy-refrigerant-with-epa-608-certification/): Quick answer: A Section 608 certified technician can generally purchase refrigerant intended for stationary air-conditioning and refrigeration equipment, subject to the refrigerant sales rules and the seller’s documentation process. - [Does EPA 608 Certification Expire? What to Do if You Lost Your Card](https://hvacnotheating.com/does-epa-608-certification-expire/): Quick answer: EPA Section 608 certification does not expire. - [EPA 608 vs. 609 Certification: Which One Do You Need?](https://hvacnotheating.com/epa-608-vs-609-certification/): Quick answer: EPA Section 608 certification is for technicians who service stationary air-conditioning and refrigeration equipment. - [How to Choose an EPA-Approved Section 608 Testing Program](https://hvacnotheating.com/epa-approved-section-608-testing-program/): Quick answer: Start with EPA’s current list of approved Section 608 certification programs, then compare the equipment level you need, the test format, location or remote-testing availability, total cost, and replacement-card policy. - [NATE Certification Practice Test](https://hvacnotheating.com/nate-certification-practice-test/): Quick answer Looking for a NATE certification practice test? Try the original multiple-choice questions below to help get ready for your NATE exam. - [Is NATE Certification Worth It? Credential Value Explained](https://hvacnotheating.com/is-nate-certification-worth-it/): Wondering if NATE certification is worth it? Learn what NATE covers, who it helps, and whether getting certified will boost your HVAC career. - [NATE Certification Study Guide: Essential Topics & Tips](https://hvacnotheating.com/nate-certification-study-guide/): Use this concise NATE certification study guide to prepare for your Core and specialty HVACR exams. Learn key concepts, practical tips, and get links to further resources. - [HVAC Certification Practice Test & Exam Overview for Technicians](https://hvacnotheating.com/hvac-certification-practice-test/): Prepare for your HVAC certification with our practice test. Learn which certifications are required, compare options, and get guidance on EPA 608, NATE, licensing, and more. - [Mini Split Not Blowing Air: Causes & Fixes](https://hvacnotheating.com/mini-split-not-blowing-air/): Is your mini split not blowing air? Diagnose and fix the most common causes—dirty filters, frozen coils, fan issues, and more—with step-by-step guidance. - [Mini Split AC Not Blowing Cold Air: Fix It Fast](https://hvacnotheating.com/mini-split-not-cooling/): Mini split AC not blowing cold air? Diagnose and fix the most common causes—dirty filters, low refrigerant, wrong mode, and more—with step-by-step repair guidance. - [Bryant Furnace Water Leak: Causes & Fixes](https://hvacnotheating.com/bryant-furnace-water-leak/): Is your Bryant furnace leaking water? Learn the most common causes and step-by-step fixes, from clogged drain lines to failed heat exchangers. - [Carbon Monoxide and Furnace Safety: When to Leave](https://hvacnotheating.com/furnace-carbon-monoxide-safety/): Is your furnace leaking water? Learn the most common causes, step-by-step DIY fixes, and when to call a pro — including what to do about a furnace co2 leak. - [Mini Split Not Blowing Cold: 6 Fixes to Try First](https://hvacnotheating.com/mini-split-not-cooling/): Is your mini split not blowing cold air? Follow our ranked troubleshooting guide to diagnose and fix the most common causes fast. - [Mitsubishi Mini Split Blinking Light: What Each Flash Means](https://hvacnotheating.com/mitsubishi-mini-split-blinking-light/): See a Mitsubishi mini split blinking light? This guide ranks the most common error code causes from easiest to hardest, with DIY steps and part links. - [Daikin Mini Split Blinking Light: A1, C9 & Error Codes](https://hvacnotheating.com/daikin-mini-split-blinking-light/): Read Daikin blinking-light codes using model-specific manuals. Check corrected A1 and C9 meanings, remote instructions, safe owner checks and a service checklist. - [Mini Split Blowing Warm Air: Causes & Fixes](https://hvacnotheating.com/mini-split-blowing-warm-air/): Is your mini split blowing warm air instead of cool? Follow our ranked troubleshooting guide to diagnose and fix the problem fast. - [LG Mini Split CH 05 Error Code: Causes & Fixes](https://hvacnotheating.com/lg-mini-split-ch-05/): See what the LG mini split CH 05 error code means, the most common causes ranked easiest first, and step-by-step fixes you can do today. - [Heat Pump Frozen Outside Unit: Causes & Fixes](https://hvacnotheating.com/heat-pump-frozen-outside-unit/): Is your heat pump frozen outside unit covered in ice? Learn the most common causes and step-by-step fixes to restore heat fast. - [Dometic AC Not Cooling – Causes & Fixes](https://hvacnotheating.com/dometic-ac-not-cooling/): Is your Dometic AC not cooling? Follow our ranked troubleshooting guide to diagnose dirty filters, low refrigerant, bad capacitors & more — fast DIY fixes inside. - [Daikin AC Not Cooling – Causes & Fixes](https://hvacnotheating.com/daikin-ac-not-cooling/): Is your Daikin AC not cooling? Follow our ranked troubleshooting guide to diagnose dirty filters, low refrigerant, frozen coils & more – fast fixes first. - [Fujitsu Mini Split Not Cooling – Fix It Fast](https://hvacnotheating.com/fujitsu-mini-split-not-cooling/): Is your Fujitsu mini split not cooling? Follow our ranked troubleshooting guide to diagnose dirty filters, low refrigerant, sensor faults, and more. - [Mini Split Smells Musty: Causes & Fixes](https://hvacnotheating.com/mini-split-smells-musty/): Find out why your mini split smells musty and how to fix it. Step-by-step DIY troubleshooting for mold, dirty filters, drain pans, and more. - [Condensate Pump Not Working & Leaking Water Fix](https://hvacnotheating.com/condensate-pump-not-working/): Is your condensate pump not working and leaking water? Follow our ranked troubleshooting guide to diagnose and fix the problem fast. - [Mr Cool Mini Split Not Heating – Fix It Fast](https://hvacnotheating.com/mr-cool-mini-split-not-heating/): Is your Mr Cool mini split not heating? Follow our ranked troubleshooting guide to diagnose and fix the most common causes fast. - [Furnace Not Heating? Causes, Fixes & Cost Guide](https://hvacnotheating.com/furnace-not-heating/): Is your furnace not heating your home? Follow our ranked troubleshooting guide to diagnose and fix the most common causes fast — DIY or pro help. - [Furnace Leaking Water: Fix a Clogged Condensate Drain](https://hvacnotheating.com/clogged-condensate-drain-line-furnace/): Is your furnace leaking water? Learn how to diagnose and fix a clogged condensate drain line furnace problem with step-by-step DIY repair guides. - [Daikin Mini Split Not Cooling – Fix It Fast](https://hvacnotheating.com/daikin-mini-split-not-cooling/): Is your Daikin mini split not cooling? Follow our ranked troubleshooting guide to diagnose dirty filters, refrigerant leaks, and more. - [Furnace Humidifier Leak: Causes & Fixes](https://hvacnotheating.com/furnace-humidifier-leak/): Diagnose and fix a furnace humidifier leak fast. Step-by-step causes, DIY repair steps, cost estimates, and when to call a pro. - [Mini Split AC Not Cooling: Causes & Fixes](https://hvacnotheating.com/mini-split-not-cooling/): Is your mini split AC not cooling? Discover the most common causes—dirty filters, low refrigerant, iced coils & more—plus step-by-step fixes. - [EPA 608 Certification Lookup: Find or Replace Your Card](https://hvacnotheating.com/epa-608-certification-lookup/): Lost your EPA 608 card? Find official provider lookup links, follow the recovery route for closed issuers, and use a checklist to prepare your replacement request. - [EPA 609 Practice Test: 30 Free Questions With Answers (2026)](https://hvacnotheating.com/epa-609-practice-test/): Free EPA 609 practice test with 30 exam-style MVAC questions, instant scoring and explanations. Covers refrigerant rules, SAE recovery standards, HFO-1234yf and the 84% pass mark. - [EPA 608 Certification Cost: What to Compare Before Paying](https://hvacnotheating.com/epa-608-certification-cost/): Learn the real EPA 608 certification cost—from exam fees to prep courses—and discover how to keep your total spending low while passing on the first try. - [How to Get EPA 608 Certification: Complete Guide](https://hvacnotheating.com/how-to-get-epa-608-certification/): Learn how to get EPA 608 certification step by step—exam types, study tips, costs, and what to expect on test day. Start your HVAC career today. - [EPA 608 Type I Practice Test: 25 Free Questions With Answers](https://hvacnotheating.com/epa-608-type-1-practice-test/): Free EPA 608 Type I practice test: 25 questions on small appliances, recovery percentages, piercing valves, R-600a and disposal rules, with instant scoring and explanations. - [EPA 608 Type III Practice Test: 25 Free Questions With Answers](https://hvacnotheating.com/epa-608-type-3-practice-test/): Free EPA 608 Type III practice test: 25 questions on low-pressure chillers, R-123, purge units, 25 mm Hg recovery, 10 psig leak testing and charging, with instant scoring. - [EPA 608 Core Practice Test: 25 Free Questions With Answers](https://hvacnotheating.com/epa-608-core-practice-test/): Free EPA 608 Core practice test: 25 exam-style questions with instant scoring and explanations. Ozone rules, the three Rs, cylinders, leak repair and safety. 72% pass mark. - [EPA 608 Type II Practice Test: 25 Free Questions With Answers](https://hvacnotheating.com/epa-608-type-2-practice-test/): Free EPA 608 Type II practice test: 25 questions on high-pressure systems, evacuation levels, R-410A, leak repair thresholds and charging, with instant scoring and explanations. - [EPA 608 Study Guide: All Sections Explained](https://hvacnotheating.com/epa-608-study-guide/): Master every section of the EPA 608 exam with this study guide covering Core, Type I, II, and III refrigerant handling concepts and key facts. - [EPA 608 Practice Test: 40 Free Questions (Core, Type I, II, III) With Answers](https://hvacnotheating.com/epa-608-practice-test/): Free EPA 608 practice test: 40 exam-style questions across Core, Type I, Type II and Type III with instant scoring, per-section results and explanations. - [Mini Split Leaking Water: Causes & Fixes](https://hvacnotheating.com/mini-split-leaking-water/): Is your mini split leaking water inside or outside? Learn the most common causes—clogged drain, frozen coil, and more—plus step-by-step fixes. - [AC Leaking Water Inside House: Causes & Fixes](https://hvacnotheating.com/ac-leaking-water-inside-house/): Is your AC leaking water inside your house? Learn the most common causes and step-by-step fixes, from clogged drain lines to frozen coils. - [Furnace Won't Ignite: Safe Checks and When to Call a Pro](https://hvacnotheating.com/furnace-won-t-ignite/): Furnace won’t ignite? Check thermostat settings, power and filters safely, record the fault code, and learn when ignition or gas-control problems need a technician. - [Heat Pump Not Heating? Fix It Fast (Step-by-Step)](https://hvacnotheating.com/heat-pump-not-heating/): Is your heat pump not heating your home? Diagnose and fix the most common causes yourself with this step-by-step troubleshooting guide. - [Furnace Leaking Water When AC Is On: Fix It Fast](https://hvacnotheating.com/furnace-leaking-water-when-ac-is-on/): Is your furnace leaking water when AC is on? Learn the top causes, step-by-step DIY fixes, part costs, and when to call a pro. - [Thermostat Not Turning On AC: Fix It Step by Step](https://hvacnotheating.com/thermostat-not-turning-on-ac/): Is your thermostat not turning on your AC? Follow our ranked troubleshooting guide to diagnose and fix the most common causes fast. - [Carrier Furnace Leaking Water: Causes & Fixes](https://hvacnotheating.com/carrier-furnace-leaking-water/): Is your Carrier furnace leaking water? Learn the most common causes—from clogged condensate drains to cracked heat exchangers—and how to fix them fast. - [Mini Split Not Heating? Fix It Fast (Top Causes)](https://hvacnotheating.com/mini-split-not-heating/): Is your mini split not heating? Diagnose and fix the most common causes yourself — from wrong mode to low refrigerant — with this step-by-step guide. - [Mini Split Not Blowing Cold Air: Fix It Fast](https://hvacnotheating.com/mini-split-not-cooling/): Is your mini split not blowing cold air? Follow our ranked troubleshooting guide to diagnose dirty filters, low refrigerant, and more — fast. - [Furnace Gas Leak: Warning Signs and Emergency Steps](https://hvacnotheating.com/furnace-gas-leak/): Suspect a furnace gas leak? Learn when to leave, who to call, and how gas leaks differ from carbon monoxide and water leaks. Official safety sources included. - [Mini Split Not Cooling? Fix It Fast (Top Causes)](https://hvacnotheating.com/mini-split-not-cooling/): Is your mini split not cooling your home? Learn the top causes and step-by-step fixes—from dirty filters to low refrigerant—plus when to call a pro. - [Furnace Leaking Water: Causes and Safe Next Steps](https://hvacnotheating.com/furnace-leaking-water/): Water under your furnace? Compare heating, cooling and humidifier clues, make safe checks, and learn when condensate, venting or electrical problems need service. - [AC Running But Not Cooling? Fix It Fast](https://hvacnotheating.com/ac-running-but-not-cooling/): Is your AC running but not cooling your home? Learn the most common causes and step-by-step fixes, from dirty filters to low refrigerant. - [Furnace Blowing Cold Air? Fix It Fast (Step-by-Step)](https://hvacnotheating.com/furnace-blowing-cold-air/): Is your furnace blowing cold air? Discover the most common causes and easy DIY fixes to get your heat back on — ranked from simplest to most complex. - [Furnace Short Cycling: Causes & Fixes](https://hvacnotheating.com/furnace-short-cycling/): Is your furnace turning on and off too quickly? Learn the most common causes of furnace short cycling and how to fix them step by step. ## Pages - [Blog](https://hvacnotheating.com/blog/) - [HVAC Troubleshooting Guides for Homeowners](https://hvacnotheating.com/): Choose an equipment problem or get help finding your EPA certification records. - [Affiliate Disclosure](https://hvacnotheating.com/affiliate-disclosure/): HVAC Not Heating may earn a commission or referral fee when a visitor purchases a product, books a service, or signs up with a third party through certain links on this website. - [Editorial Policy](https://hvacnotheating.com/editorial-policy/): HVAC Not Heating aims to publish troubleshooting information that is understandable, transparent, and safe to use. - [Contact](https://hvacnotheating.com/contact/): The article URL. - [About HVAC Not Heating](https://hvacnotheating.com/about-hvac-not-heating/): HVAC Not Heating is an independent educational website for homeowners who want to understand a heating or cooling problem before deciding what to do next. - [Privacy Policy](https://hvacnotheating.com/privacy-policy/): This Privacy Policy explains what information HVAC Not Heating may collect, why it is used, and the choices available to visitors. ## Optional - [Agent (MCP protocol)](websites-agents.hostinger.com/hvacnotheating.com/mcp) [comment]: # (Generated by Hostinger Tools Plugin)