TryBuildCalcHVAC Resources (14 guides)
Central air vs ductless comparisons, heat pump vs furnace guidance, efficiency rating explainers, refrigerant types, and practical HVAC reference topics.
Resources in this section
- Central Air vs Ductless Mini-Split: Which Is Best→
Head-to-head comparison of central ducted air conditioning and ductless mini-split heat pumps covering installed cost, efficiency, duct losses, zoning, noise, and the best-fit scenario for each — with a worked cost example.
- Heat Pump vs Gas Furnace: Which Is Best→
Head-to-head comparison of electric heat pumps and gas furnaces covering installed cost, running cost, efficiency (COP vs AFUE), cold-climate performance, balance point, backup heat, and dual-fuel hybrid systems.
- SEER vs SEER2 Ratings Explained→
Explains the difference between the old SEER rating and the current SEER2 (plus EER2 and HSPF2) ratings — the 2023 DOE test procedure change behind it, why SEER2 numbers run lower for the same equipment, and how regional minimum efficiency standards apply.
- MERV Rating Guide for HVAC Air Filters→
Explains the MERV filter rating scale (ASHRAE Standard 52.2) from MERV 1 to 16, what particle sizes each range actually captures, the airflow/static-pressure trade-off of upgrading to a higher MERV filter, and how MERV compares to true HEPA filtration.
- HVAC Refrigerant Types: R-410A vs R-32 vs R-454B→
Explains the refrigerant transition reshaping residential HVAC — why R-410A is being phased down under the EPA's AIM Act, how R-32 and R-454B compare on GWP and flammability, what it means for existing systems, and what to know before servicing new A2L equipment.
- AC & Furnace Repair vs Replace: How to Decide→
A decision framework for repairing versus replacing an aging air conditioner, heat pump, or furnace — the $5,000 rule, age and repair-frequency thresholds, safety-critical failures, and refrigerant-availability factors, with worked examples.
- Boiler vs Furnace: Which Heating System Is Best→
Compares hydronic boilers and forced-air furnaces on installed cost, comfort, lifespan, and cooling compatibility, with a worked 20-year cost example.
- Radiant Floor Heating vs Forced-Air: Pros, Cons & Cost→
Compares radiant floor heating and forced-air heating on comfort, cost, response time, and floor covering compatibility, with a worked heat-output example.
- Window AC vs Portable AC vs Mini-Split: Which Fits Your Room→
Compares window, portable, and mini-split ACs on cost, efficiency, and installation, and explains the SACC-vs-ASHRAE-BTU sizing trap for single-room cooling.
- Evaporative Cooler vs Central Air Conditioning: Which Is Best→
Compares evaporative coolers and central AC on climate suitability, cost, and humidity effects, with a worked delivered-cooling estimate.
- Why Is My AC Leaking Water? Condensate Drain Troubleshooting→
Diagnoses the common causes of an AC leaking water — clogged drains, frozen coils, dry traps, and bad slope — with a symptom-to-cause table.
- Whole-House Fan vs Attic Fan vs AC: Cooling Without a Compressor→
Compares whole-house fans, powered attic fans, and central AC on what each actually cools and when a compressor-free option works, with a cost example.
- Whole-House Humidifier vs Dehumidifier: Do You Need One?→
A decision framework for choosing a whole-house humidifier vs dehumidifier by symptoms, season, and climate, targeting the 30-50% comfort range.
- AFUE & HSPF Ratings Explained→
Explains AFUE (furnace/boiler efficiency) and HSPF2 (heat pump heating efficiency) — what they measure and how they differ from SEER2.