HVAC Maintenance Guide — DIY Tips & Seasonal Checklists
Your trusted national resource for AC units, heat pumps, furnaces, and mini-splits. Learn how to maintain your system year-round, what to DIY safely, and when to call a professional.
Seasonal Maintenance Checklists
Spring
- Replace/clean filters.
- Rinse condenser coils.
- Check refrigerant lines.
Summer
- Maintain steady setpoints.
- Inspect drain lines.
- Watch for ice buildup.
Fall
- Test heating early.
- Replace filters again.
- Schedule tune-up.
Winter
- Keep vents clear of snow.
- Monitor noises and smells.
- Inspect safety devices.
DIY vs. Professional Maintenance
| DIY-Friendly | Call a Licensed Technician |
|---|---|
| Filter changes, basic coil rinsing, clearing drain lines. | Refrigerant handling, electrical diagnostics, gas systems. |
| Thermostat programming and schedule setup. | Compressor, blower, or motor replacement. |
| Vacuuming return vents and sealing small duct leaks. | Any work affecting warranty or safety systems. |
Typical HVAC Repair & Service Costs
| Service | Average Cost | Notes |
|---|---|---|
| Annual tune-up | $100-$250 | Includes coil clean, pressures, electrical check. |
| Drain cleaning | $90-$250 | Flush line and replace safety switch. |
| Capacitor or contactor | $120-$380 | Common mid-summer repair. |
| Blower motor replacement | $450-$1,200 | Varies by type (PSC vs. ECM). |
Frequently Asked Questions
How often should I change my filter?
Every 30-90 days depending on dust and pets. Media filters (4-5″) can last up to 6 months.
Do I really need annual maintenance?
Yes — it helps sustain efficiency, reduce breakdowns, and keep warranty coverage valid.
What’s a normal temperature split?
Usually 15-20°F between return and supply air under normal conditions.