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FAQs – Serrano’s Heating & Cooling

Frequently Asked Questions

Family-owned • Serving Tucson since 2006 Google 5.0 ★★★★★ (60+ reviews)

Clear, honest answers from Tucson’s trusted local HVAC pros – helping you stay comfortable all year in Arizona’s desert climate!

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General HVAC Basics
What does HVAC stand for?

Heating, Ventilation, and Air Conditioning – the complete system that controls temperature, humidity, airflow, and indoor air quality in your home.

How often should I replace my air filter?

Every 1–3 months is standard. Change monthly if you have pets, allergies, or live in a very dusty area. Clean filters improve efficiency, lower bills, and protect your equipment.

Heat pump vs traditional split system – what’s the difference?

Heat pumps use electricity to both cool your home in summer (like a standard AC) and heat it in winter by transferring heat from outside air indoors while gas systems pair an electric air conditioner for cooling with a separate gas furnace that burns fuel to generate intense, fast-heating air for winter. We help you choose based on your home and usage.

How long do HVAC systems typically last?

With regular maintenance: air conditioners 12–18 years, furnaces 15–25 years. Proper care, clean filters, and annual tune-ups can significantly extend equipment life.

What is a SEER rating?

SEER stands for Seasonal Energy Efficiency Ratio – it measures how efficiently your AC cools over a season. Higher SEER means lower energy use and bills, especially in hot climates like ours!

What’s the role of ventilation in HVAC?

Ventilation brings in fresh air, removes stale air, and controls humidity. It’s key for indoor air quality, preventing mold, and keeping your home healthy and comfortable.

What’s the difference between central and ductless systems?

Central systems use ducts to distribute air throughout the home; ductless (mini-splits) mount directly in rooms for zoned control – great for additions or older homes without ducts.

Why is humidity control important in Arizona?

Even in our dry climate, monsoon season brings humidity. Proper HVAC dehumidifies air, preventing discomfort, mold, and efficiency loss – keeping your home fresh and cool.

Maintenance & Troubleshooting
What routine maintenance prevents most breakdowns?

Change filters regularly, keep the outdoor unit clear of debris/plants, schedule professional tune-ups (spring for AC, fall for heating), check thermostat batteries, and watch for unusual noises or smells. Preventive care avoids ~80% of major issues.

My AC is running but the house isn’t cooling – what’s wrong?

Common causes: low refrigerant (leak), dirty coils, blocked vents/registers, failing capacitor, thermostat problems, or an undersized system. Call a pro for accurate diagnosis before small issues become expensive.

Why am I getting strange smells from the vents?

“Dirty sock” smell = bacteria/mold on coils (needs professional cleaning). Burning/electrical = immediate shut-off and service call. Musty = possible duct or attic mold. We offer coil cleaning and UV lights to prevent return.

Are smart thermostats worth it in a hot climate like Tucson?

Yes – very! They learn your schedule, adjust automatically, support geofencing, and can cut energy use 10–25% by optimizing runtime during our long cooling season. App control is great when you’re away.

How do I clean my AC coils at home?

Use a soft brush or vacuum on outdoor condenser fins; for indoor evaporator, a no-rinse coil cleaner spray. But for deep cleans, pros use specialized tools to avoid damage – schedule annually!

What if my thermostat screen is blank?

Check batteries, circuit breaker, or wiring. If it’s hardwired, a tripped breaker or blown fuse could be the issue. If resetting doesn’t help, it might need replacement – we install smart options!

Why is my system short-cycling?

Turning on/off frequently? Causes: oversized unit, dirty filters, low refrigerant, or thermostat issues. It wastes energy and wears parts faster – get a pro check to fix it efficiently.

Do you offer AC tune-ups and maintenance plans in Tucson?

Yes — our VIP Maintenance Plans include two professional tune-ups per year (spring AC + fall heating), priority scheduling, 10–15% repair discounts, and more. Plans start at affordable monthly rates and significantly extend system life while preventing breakdowns.

Energy Efficiency & Cost Savings
How can I lower my summer cooling bills the most?

Set thermostat to 78°F or higher when home, use fans, seal air leaks around doors/windows, add window films or shades, maintain your system, and consider upgrading to a high-SEER unit. We offer free energy assessments to find your biggest wins.

What SEER2 rating should I aim for in Arizona?

16–20 SEER2 is ideal for our climate and long cooling months. Higher SEER can reduce bills 20–40% compared to older 10–14 SEER2 units. Many new systems qualify for utility rebates.

Do ceiling fans really help save on air conditioning?

Yes – they create a wind-chill effect, letting you comfortably raise the thermostat 3–4°F. Run counterclockwise in summer. Combined with good insulation and sealing, it’s one of the simplest ways to cut cooling costs.

What’s the difference between single-stage, two-stage, and variable-speed systems?

Single-stage: Runs at full power only – not very efficient and can cause temp swings. Two-stage: Operates at low/high speeds for better efficiency and comfort. Variable-speed: Adjusts continuously for precise control, unmatched comfort, whisper-quiet operation, and max energy savings (up to 40% less than single-stage) – perfect for Arizona’s heat!

How does insulation affect HVAC efficiency?

Good insulation keeps cool air in and heat out, reducing system workload. Check attic/floors/walls – adding R-30+ in attics can cut bills 10–20%.

What’s zoning and how does it save energy?

Zoning divides your home into areas with separate thermostats/dampers. Cool only occupied rooms – saves 20–30% on energy. Ideal for larger homes or varying schedules.

How do programmable thermostats help?

They auto-adjust temps when you’re asleep/away, potentially saving 5–15% annually. Upgrade to smart models for even more – they learn habits and optimize for Arizona’s temp extremes.

Why is my energy bill so high in summer even with the AC running?

Common causes include poor insulation, dirty coils/filters, duct leaks, an aging or low-SEER unit, or high thermostat settings during peak heat. We offer free energy audits to identify leaks and the biggest opportunities for savings in Tucson’s climate.

What rebates or tax credits are available for new HVAC systems right now?

The federal Energy Efficient Home Improvement Credit (25C) expired at the end of 2025, but many high-efficiency systems (15.2+ SEER2) still qualify for local utility rebates from TEP, SRP, or Efficiency Arizona programs (e.g., up to $600–$720 for qualifying AC/heat pump installs). We stay updated on current incentives and help maximize any available savings during your free consultation.

Installations, Repairs & System Upgrades
How long does a new HVAC system installation usually take?

Most residential replacements take 1–2 full days. We protect your home, remove old equipment responsibly, install precisely, test thoroughly, and explain everything before we leave.

What are early warning signs my system needs repair or replacement?

Uneven temperatures, rising bills without reason, loud/unusual noises, weak airflow, frequent on/off cycling, strange odors, or the unit is 10+ years old with increasing repairs. Early action prevents bigger breakdowns.

Can you service and repair all major brands?

Yes – American Standard, Trane, Carrier, Lennox, Goodman, Rheem, Bryant, Amana, Daikin, Mitsubishi, and all others. Our certified technicians stay up-to-date on diagnostics, parts, and best practices for every brand we encounter.

When does it make more sense to replace instead of repair?

If repair costs are over 50% of a new system’s price, you have frequent breakdowns, efficiency is poor (high bills), or the unit is 12+ years old. New systems bring better reliability, lower operating costs, quieter operation, and smart features.

What’s involved in a system upgrade?

We assess your home’s size/needs, recommend efficient options, install new equipment, optimize ducts, and train you on use. Upgrades often include smart tech for better control.

How do I know if my system is the right size?

We use Manual J calculations based on home size, insulation, windows, etc. Undersized struggles to cool; oversized cycles too much, wasting energy. Proper sizing ensures comfort and efficiency.

What about adding UV lights or air purifiers?

UV lights kill mold/bacteria in coils; purifiers filter allergens. Great for allergies or clean air – we integrate them during installs/repairs for healthier indoor environments.

Can you convert from swamp cooler to central AC?

Yes! We remove the evaporative cooler, install ducts if needed, and set up efficient central AC. It’s a popular upgrade in Tucson for better cooling and humidity control.

How much does a new AC unit cost in Arizona in 2026?

Complete installed prices typically range from $7,000–$15,000+ depending on size (tons), efficiency (SEER2 rating), brand, features (variable-speed, zoning), and home specifics. We provide transparent, no-obligation quotes after a free in-home assessment tailored to your Tucson property.

Is it better to repair or replace a 15-year-old air conditioner?

At 15+ years, replacement is usually more cost-effective — especially if repair costs exceed ~50% of a new system, efficiency is low (high bills), or you’ve had multiple repairs. New units deliver 30–50% lower energy costs, better reliability, quieter operation, and modern features suited to Arizona heat.

Serrano’s Heating & Cooling Specific
What areas do you serve in Arizona?

Tucson and surrounding communities including Catalina Foothills, Oro Valley, Dove Mountain, Marana, Vail, Sahuarita, and nearby areas. As locals, we know Arizona’s extreme climate and how it affects HVAC systems.

What warranties do your installations include?

Typically 10–12 years on parts and labor for qualifying premium systems, plus full manufacturer coverage and our workmanship guarantee. But we also offer warranties that cover up to 10 years of trip charges, hourly labor, parts, & refrigerant (meaning you don’t spend a dime on any and all repairs for an entire 10 years!). We provide clear documentation and help with any warranty claims.

Why choose a family-owned local company like Serrano’s?

Personalized, no-pressure service; honest, tailored recommendations; deep knowledge of desert HVAC challenges; fast local response; and genuine long-term relationships with our neighbors.

Do you offer 24/7 emergency service?

Yes – true 24/7 availability for true emergencies. AC breakdowns in summer or heating failures in winter don’t wait for business hours. Call anytime; we respond quickly to restore comfort safely.

How does your referral program work?

Refer a friend or family member for service/repair and earn $25 credit each, or $100 credit for a successful new system installation. No limit on referrals. Just mention the referrer when booking or use the form on our referral page!

What financing options do you offer?

We partner with lenders for flexible and simple payments on installations/upgrades. Applying with us does not affect your credit score at all. Get pre-approved easily – comfort shouldn’t wait for your budget!

Are your technicians certified?

Yes – all are EPA certified and background-checked. Ongoing training keeps them experts in the latest tech and safety standards.

Do you offer maintenance plans?

Our VIP plans include biannual tune-ups, priority service, discounts on repairs, and more. They extend system life and catch issues early – starting at affordable monthly rates!

How can I schedule a free consultation?

Call us, use our online form, or stop by. We’ll assess your needs, provide honest advice, and quote without obligation – let’s make your home more comfortable!

How quickly can you come fix my AC in summer?

We prioritize summer AC emergencies with same-day or next-day service for most Tucson-area calls (subject to parts availability and current demand). Our 24/7 team gets you back to cool as fast as possible during extreme heat.

Still have questions?

We’re here to help — call us anytime for honest answers or to schedule service.

24/7 Emergency Service • Family-Owned • Tucson Local Experts