How much warranty period do I have after an appliance repair?

I live with my wife in San Clemente, and I am looking to install a new heater in my house and an air conditioner. I'm looking for the best installers that I can find in the area. We're new to the area, and we don't know who the best people are. I've been calling for installers in the area and recommend us. We have yet to choose a model, and we talked with several guys who want to sell us Lennox's basic model, so I'm wondering how many brands you represent. We currently have a Day & Night HVAC unit. Do you sell that brand? I need a good installer, someone who knows how to make a basic machine as quiet as possible, and someone who could replace the ducts.

How much does it cost to replace a thermocouple on a furnace?

How much does it cost to upgrade to a programmable thermostat for my Goodman DSXC18 central air conditioner?

How much does it cost to replace a damaged burner on my Wolf gas cooktop?

Can I get recommendations on improving energy efficiency for my American Standard Silver 16 Low Profile air conditioner?

Where is the reset button on a Rheem air conditioner model no. raka-037 jaz?

How to replace door handle part number WP8269117 on KitchenAid dishwasher?

What should be the procedure for checking and replenishing refrigerant levels in the Carrier AquaEdge® 19DV series chillers to ensure proper operation?

How often should I clean or replace the air filter in the Amana Series air conditioner model AHC12LYW1 for optimal indoor air quality and energy efficiency?

how long do maytag 2018 refrigerator filters last